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H

Definition: H

H

Noun

1. A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.

2. A unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second.

3. The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10\-34 joule-second.

4. The 8th letter of the Roman alphabet.

5. A narcotic that is considered a hard drug; a highly addictive morphine derivative.

Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.
 

Date "H" was first used in popular English literature: sometime before 1350. (references)

 

Specialty Definition: H

DomainDefinition

Computing

H [from SF fandom] A method of `marking' common words, i.e., calling attention to the fact that they are being used in a nonstandard, ironic, or humorous way. Originated in the fannish catchphrase "Bheer is the One True Ghod!" from decades ago. H-infix marking of `Ghod' and other words spread into the 1960s counterculture via underground comix, and into early hackerdom either from the counterculture or from SF fandom (the three overlapped heavily at the time). More recently, the h infix has become an expected feature of benchmark names (Dhrystone, Rhealstone, etc.); this is probably patterning on the original Whetstone (the name of a laboratory) but influenced by the fannish/counterculture h infix. Source: Jargon File.

Mathematics

Two(or more)samples selected in such a way that each case(e. g. , person)in one sample is matched-i. e. , identical within specified limits-on one or more preselected characteristics with a corresponding case in the other sample. Source: European Union. (references)

Space

Hour, 60 minutes of time. (references)

Source: compiled by the editor from various references; see credits.

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Specialty Definition: Aozora Bunko: H

(From Wikipedia, the free Encyclopedia)

See Aozora Bunko

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Carbonic acid

(From Wikipedia, the free Encyclopedia)

Carbonic acid is an acid with the chemical formula of H2CO3. It is the reaction product of water and carbon dioxide and exists in an equilibrium with water and carbon dioxide whenever the latter is dissolved in the former, for instance in soda water or blood. It is not possible to obtain pure carbonic acid.

In solution, carbonic acid can lose one or two protons. Removing the first proton from carbonic acid forms the bicarbonate ion; removing the second proton leads to the carbonate ion.

When carbonic acid is combined with positive or basic atoms or radicals, salts called carbonates or bicarbonates can form. For instance, combined with lime (calcium oxide) it constitutes marble and chalk (calcium carbonate).

Carbonic acid is present in carbonated soft drinks. In such beverages it occurs in approximately 150 times the concentration than in the natural occurrence which aided in the carving of Mammoth Cave.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Carbonic acid."

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Casualties of the September 11, 2001 Terrorist Attacks

(From Wikipedia, the free Encyclopedia)

Any tributes to the individuals lost in this tragedy are welcome and encouraged at our memorial site. Some articles originally posted to wikipedia have been moved there - if you are looking for such an article, please check there.

See also Missing Persons, Foreign casualties, and Survivors.

Casualties

Planes - World Trade Center - Pentagon
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

As of October 29, 2003, 2,995 people were presumed dead as a result of all four September 11 attacks. This includes the casualties at the World Trade Center, the Pentagon, on the airplanes and the hijackers.

Planes

265 people killed on four planes; 232 passengers, 25 flight attendants, 8 pilots. (Note that this total includes the 19 hijackers, who reportedly boarded the planes as passengers.)

See also: Memorial wiki tributes to the occupants of each plane

World Trade Center

By October 29, 2003, 2605 people were listed as confirmed dead and 1058 bodies had been identified. (Note: this total does not include the 127 passengers and 20 crew on the two aircraft or the 10 hijackers).

The listing and memorial.

See also:

Missing Persons

The number of missing people grew to estimates as high as over 6000 in the months following the attack, but steadily declined as stories were checked and duplicate entries removed. (See Timeline of WTC missing).

As of August 2002, there were approximately 90 people who were officially missing; that is, their remains had not been identified and no family members had requested a death certificate.

Detailed listing.

Survivors

The great majority of the over 40,000 people working at the World Trade Center at the time of the attack evacuated safely, including 18 who escaped from above the impact zone in the second tower hit. By 9/20/2001 6291 people, including rescue and recovery workers, had been treated for injuries.

Detailed listing.

Pentagon

The Pentagon reports 125 staffers killed or missing, with 121 remains recovered and identified, as of Sept. 11, 2002. At least one person died later as a result of wounds incurred.

The listing and memorial.

Missing Persons

The Pentagon reports 4 staffers missing. One passenger on the airliner which hit the Pentagon was also never identified.

Detailed listing.

Survivors

88 treated at hospital.

Detailed entry.

Victim legends

Due to the very large number of World Trade Center casualties and missing persons, victim legends were a common form of September 11, Terrorist Attack urban legends. These were tales of victims who did not exist, spread by word-of-mouth and the Internet. Official sites, such as http://www.september11victims.com, contain accurate entries and are trusted content. Because Wikipedia, and many other websites allowed freely adding victims, there were no doubt many obvious fake entries. Fake victims added to these lists were often simply missing at the time of the attacks, or actually survivors of the attacks.

See also

September 11, 2001 Terrorist Attack - Donations - Assistance - Memorials and Services

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Casualties of the September 11, 2001 Terrorist Attacks."

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Deuterium

(From Wikipedia, the free Encyclopedia)

Deuterium (symbol 2H) is a stable isotope of hydrogen with a natural abundance of one part in 7000 of hydrogen. The nucleus of deuterium (called a deuteron) has one proton and one neutron, whereas a normal hydrogen nucleus just has one proton. Deuterium is also called heavy hydrogen. While it is not an element in its own right, it is often given the symbol D. It occurs naturally as deuterium gas, D2 or 2H2.

Deuterium was discovered in 1931 by Harold Clayton Urey, a chemist at Columbia University, for which he earned the Nobel prize in chemistry in 1934.

It is useful in nuclear fusion reactions, as is tritium, because of the larger rate of reaction (or cross section) and high energy yield of the D-T reaction.

Deuterium can replace the normal hydrogen in water molecules to form heavy water (D2O), which was a source of some concern during World War II, as Germany was known to be conducting experiments using heavy water as a nuclear reactor moderator, which might allow them to produce plutonium for an atomic bomb. This led to an important Allied special forces operation to destroy a deuterium production facility in Norway.

Deuterium is frequently used in chemistry and biochemistry as a tracer molecule to study reaction pathways because chemically it behaves identically to ordinary hydrogen, but it can be distinguished from ordinary hydrogen by its mass. Also, because of its greater mass, chemical reactions involving deuterium tend to occur at a slower rate than the corresponding reactions involving ordinary hydrogen.

It has been suggested that deuterium water (heavy water) should be considered toxic because if consumed in isolation it would displace light water and disturb the rate of biochemical reactions in the body. See heavy water for a discussion of this.

The existence of deuterium in stars is one of the arguments in favour of the big bang theory over the steady state theory. Stellar fusion destroys deuterium and there are no known processes other than the big bang itself which produce deuterium.

Canada is the world's leading producer of deuterium as it is needed for the operation of the CANDU reactor.

Data

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H

(From Wikipedia, the free Encyclopedia)

H, which in reference is spelled aitch (or sometimes haich by speakers of dialects—primarily Irish and Australian—which pronounce a h in the letter name), is the eighth letter of the latin alphabet.

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

The Semitic letter ח (Ħêt) probably represented the phoneme /X/ (pharyngeal voiceless fricative) (IPA [ħ]). The form of the letter probably stood for a fence. Early Greek H stood for /h/, but later on &Eta or &eta (Êta) stood for /E:/. In Modern Greek this phoneme fell together with /i/, similar to the English development where EA /E:/ and EE /e:/ came to be both pronounced /i:/ . In Etruscan and Latin, the sound value /h/ was maintained, but all Romance languages lost the sound - only Romanian borrowed the /h/ phoneme from its neighbouring Slavic languages and Castilian /x/ developed [h] allophones in some Spanish-speaking countries.

Hotel represents the letter H in the NATO phonetic alphabet.

H is also:

Two-letter combinations starting with H:

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H2 antagonist

(From Wikipedia, the free Encyclopedia)

An H2 antagonist is a drug used to block the action of histamine on parietal cells in the stomach, decreasing acid production by these cells. They are used in the treatment of peptic ulcers.

H2 antagonist drugs (such as cimetidine) work by blocking the H2 subtype of histamine receptors. These are different receptors from those involved in the allergic response.

Since the advent of proton pump inhibitors, use of these drugs to treat ulcers has declined.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "H2 antagonist."

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Henry (inductance)

(From Wikipedia, the free Encyclopedia)

The henry (symbol H) is the SI unit of inductance. If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry.

The henry has dimensions V·A-1·s = m²·kg·s-2·A-2 in SI units.

The unit is named after the American scientist Joseph Henry.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Henry (inductance)."

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Hit (baseball statistics)

(From Wikipedia, the free Encyclopedia)

In baseball statistics, a hit (denoted by H) is credited to a batter when he safely reaches base as the result of striking the ball, without the benefit of an error or a fielder's choice.

In cases where a ball takes a funny bounce, and a fielder might have a chance of throwing the runner out but does not, it is at the official scorer's discretion whether the batter is given a hit or instead reached on an error.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Hit (baseball statistics)."

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Hour

(From Wikipedia, the free Encyclopedia)

In modern usage, an hour is defined as a unit of time 60 minutes, or 3600 seconds in length. It is approximately 1/24 of a median Earth day.

Earlier definitions of the hour:

Counting hours

Every definition of the hour came with its own starting point for counting the hours.

This manner of counting hours has the advantage that everyone can easily read the clock to see how much time he will have to finish his daywork without artificial light. It was introduced in Italy during the 14th century and lasted until mid-18th century, in some regions until mid-19th century. It was also used in Poland and Bohemia until the 17th century. Sunrise and sunset are much more conspicuous points in day than noon or midnight; starting to count then is much easier than starting at noon or midnight. With modern astronomic equipment (and the telegraph or similar means to transfer a time sign in a split-second), this issue is no more relevant.

Sundials often show the hour length and count according to one of the older definitions and countings.

There are probably 12 hours because there are approximately 12 lunar months in a solar year. Symmetries of this sort are common in ancient units of measurement.

See also: canonical hours, times from 1 kilosecond to 10 kiloseconds

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Hour."

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Hydrogen

(From Wikipedia, the free Encyclopedia)

simple:hydrogen

Hydrogen - Helium
 
H
Li  
 
 

Full table
General
Name, Symbol, NumberHydrogen, H, 1
Chemical series nonmetals
Group, Period, Block1 (IA), 1 , s
Density, Hardness 0.0899 kg/m3, NA
Appearance colorless
Atomic Properties
Atomic weight 1.00794 amu
Atomic radius (calc) 25 (53) pm
Covalent radius 37 pm
van der Waals radius 120 pm
Electron configuration 1s1
e- 's per energy level1
Oxidation states (Oxide) 1 (amphoteric)
Crystal structure hexagonal
Physical Properties
State of matter gas
Melting point 14.025 K (-434 °F)
Boiling point 20.268 K (-423 °F)
Molar volume 11.42 ×1010-3 m3/mol
Heat of vaporization 0.44936 kJ/mol
Heat of fusion 0.05868 kJ/mol
Vapor pressure 209 Pa at 23 K
Speed of sound 1270 m/s at 298.15 K
Miscellaneous
Electronegativity 2.2 (Pauling scale)
Specific heat capacity 14304 J/(kg*K)
Electrical conductivity __ 106/m ohm
Thermal conductivity 0.1815 W/(m*K)
Ionization potential 1312 kJ/mol
Most Stable Isotopes
isoNAhalf-life DMDE MeVDP
1H99.985%H is stable with 0 neutrons
2H0.015%H is stable with 1 neutron
3H{syn.}12.33 yβ-0.0193He
4H{syn.}unknownn2.9103H
SI units & STP are used except where noted.
Hydrogen (Wiktionary:Hydrogen) is a chemical element in the periodic table that has the symbol H and atomic number 1. A colorless, odorless, non-metal, univalent, highly flammable diatomic gas, hydrogen is the lightest and most abundant element in the universe and is present in water and in all organic compounds and living organisms. Hydrogen is able to chemically react with most elements. Stars in their main sequence are overwhelmingly composed of hydrogen in its plasma state. This element is used in ammonia production, as a lifting gas, an alternative fuel, and more recently as a power-source of fuel cells.

In laboratory, it is prepared by reaction of acids on metals like zinc. For production in large scale, electrolysis of water is a widely used method. Scientists are now trying to develop new methods that involve use of green algae for hydrogen production.

Notable Characteristics

Hydrogen was the lightest chemical element with its most common isotope consisting of just a single proton and electron. At standard temperature and pressure conditions, hydrogen forms a diatomic gas, H2, with a boiling point of only 20.27 K and a melting point of 14.02 K. Under exceedingly high pressures, like those found at the center of gas giants, the molecules lose their identity and the hydrogen becomes a liquid metal (see metallic hydrogen). Under the exceedingly low pressure conditions found in space, hydrogen tends to exist as individual atoms, simply because there is no way for them to combine; clouds of H2 form and are associated with star formation.

This element plays a vital role in powering the universe through the proton-proton reaction and carbon-nitrogen cycle (these are nuclear fusion processes that release huge amounts of energy through combining two hydrogen atom into one helium).

Applications

Large quantities of hydrogen are needed industrially, notably in the Haber process for the production of ammonia, the hydrogenation of fats and oils, and the production of methanol. Other uses that require hydrogen: 


Hydrogen can be burned in internal combustion engines, and a fleet of hydrogen burning cars is maintained by Chrysler-BMW. Hydrogen fuel cells are being looked into as a way to provide potentially cheap, pollution-free power. 


History
 

Hydrogen (French for water-maker, from Greek hudôr, "water" and gennen, "generate") was first recognized as a distinct substance in 1776 by Henry Cavendish. Antoine Lavoisier gave the element its name.  


Occurrence
 

Hydrogen is the most abundant element in the universe, making up 75% of normal matter by mass and over 90% by number of atoms. This element is found in great abundance stars and gas giant planets. Relative to its great abundance elsewhere, hydrogen is very rare in the earth's atmosphere (1 ppm by volume). The most common source for this element on earth is water which is composed two parts hydrogen to one part oxygen (H2O). Other sources are; most forms of organic matter which includes all known life forms, coal, fossil fuels and natural gas. Methane (CHH4), which is a byproduct of organic decay, is an increasingly important source of hydrogen.     

Hydrogen is prepared in several different ways;  steam on heated carbon, hydrocarbon decomposition with heat, action of sodium or potassium hydroxide on aluminum, water electrolysis, or by displacement from acids with certain metals.

Commercial bulk Hydrogen is usually manufactured by decomposing natural gas.


Compounds
 

The lightest of all gases, hydrogen combines with most other elements to form compounds. Hydrogen has an electronegativity of 2.2, so it forms compounds where it is the more non-metallic and where it is the more metallic element.  The former are called hydrides, where hydrogen either exists as H- ions or just as a solute within the other element (as in Palladium  hydride).  The latter tend to be covalent, since the H+ ion would be a bare nucleus and so has a strong tendency to pull electrons to itself.  These both form acids. Thus even in an acidic solution one sees ions like H3O+ as the protons latch on to something. 

Hydrogen combines with oxygen to form water, H2O, and releases a lot of energy in doing so, burning explosively in air. Deuterium oxide, or D2O, is commonly referred to as heavy water. Hydrogen also forms a vast array of compounds with carbon. Because of their association with living things, these compounds are called organic compounds, and the study of the properties of these compounds is called organic chemistry. 


Forms
 

Under normal conditions hydrogen gas is a mix of two different kinds of molecules which differ from one another by the "direction" that their electrons' and nuclei spin. These two forms are known as ortho- and para-hydrogen (this is different than isotopes, see below). At standard conditionss normal hydrogen is comprised of 25% of the para form and 75% of the ortho form. The ortho form can't be prepared in its pure state. The two forms of hydrogen differ in energy and this results in slightly different physical properties. For example, the melting and boiling points of parahydrogen are about 0.1 ° K lower than orthohydrogen (the so-called "normal" form).  


Isotopes
 

The most common hydrogen isotope, protium, has no neutrons, although there are two others - deuterium with one, and radioactive tritium with two neutrons. The two stable isotopes are protium (H-1) and deuterium (H-2, D). Deuterium comprises 0.0184-0.0082% of all hydrogen (IUPAC); ratios of deuterium to protium are reported relative to the VSMOW standard reference water. A radioactive isotope, tritium (T or H-3) has one proton and two neutrons.  

Hydrogen is the only element that has different names for its isotopes.  


Precautions
 

Hydrogen is a 
highly flammable gas. It also reacts violently with chlorine and fluorine. D2O, or heavy water, is toxic to many species. The quantity required to kill a human, however, is substantial. 


See also

periodic table, hydrogen bond, hydrogen atom, antihydrogen, hydrogen car, photohydrogen.


External Links


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Hydrogen peroxide
(From Wikipedia, the free Encyclopedia)






 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Properties




General





Name
 Hydrogen peroxide


Chemical formula
 H2O2


Appearance
 Colourless liquid




Physical





Formula weight
 34.0 amu


Melting point
 272.6 K (-0.4 °C)


Boiling point
 423 K (150 °C)


Density
 1.4 ×103 kg/m3


Solubility
 miscible




Thermochemistry





ΔfH0gas
 -136.11 kJ/mol


ΔfH0liquid
 -188 kJ/mol


ΔfH0solid
 -200 kJ/mol


S0gas, 1 bar
 232.95 J/mol·K


S0liquid, 1 bar
 110 J/mol·K


S0solid
 ? J/mol·K




Safety



Ingestion
 Serious injury, death possible.


Inhalation
 Severe irritation, death possible.


Skin
 Causes bleaching—flush immediately.


Eyes
 Dangerous.


More info
 Hazardous Chemical Database



 
   SI units were used where possible. Unless otherwise stated, standard conditions were used.
   
Disclaimer and references
 
 



The chemical compound hydrogen peroxide (H2O2) is a viscous liquid that has strong oxidizing properties and is therefore a powerful bleaching agent that has found use as a disinfectant and (in strong concentrations) as an oxidizer or monopropellant in rockets.

It is commonly used (in very low concentrations, such as 5%) to bleach human hair, hence the phrases "peroxide blonde" and "bottle blonde". It burns the skin if it comes into contact in sufficient concentration.  In lower concentrations, it is used medically for cleaning wounds and removing dead tissue.  

Hydrogen peroxide tends to decompose exothermically into water and oxygen gas. The rate of decomposition is dependent on the temperature and concentration of the peroxide, as well as the presence of impurities and stabilizers. The ability of peroxide to coexist with a substance is called compatibility. Peroxide is incompatible with many substances, including most of the transition metals (i.e. iron, copper, silver, cobalt, etc.) and their compounds, many organic compounds, dirt, human beings, etc. Spilling high concentration peroxide on an flammable substance can cause an immediate fire.

The use of a catalyst (such as manganese dioxide, silver, or the enzyme catalase) vastly increases the rate of decomposition of hydrogen peroxide. High strength peroxide (also called high-test peroxide, or HTP) must be stored in a vented container to prevent the buildup of pressure leading to the eventual rupture of the container. Any container must be made of a compatible material such as polyethylene or aluminum (not stainless steel) and be cleaned of all impurities (a process sometimes referred to as passivation) prior to the introduction of peroxide.

Hydrogen peroxide has also been used as a propellant. In the 1930s and 40s, Hellmuth Walter pioneered methods of harnessing the rapid decomposition of Hydrogen peroxide in gas turbines and rocket engines. Its use in torpedoes has been discontinued by most navies due to safety considerations.  A hydrogen peroxide leak was blamed for the sinkings of HMS Sidon and the Russian submarine Kursk.  

Hydrogen peroxide works best as a propellant in extremely high concentrations. However, there are very few suppliers of high purity hydrogen peroxide, and they are averse to selling to any but the largest institutions.  As a result, amateurs wishing to use this for rocket fuel usually have to purchase 70% or lower purity (most of the remaining 30% is water, and sometimes there are traces of stabilizing materials, such as tin, to reduce the decomposition rate), and increase its concentration themselves, since 70% makes for extremely poor propellant compared to 90% or better.  Many try distillation, but this is extremely dangerous with hydrogen peroxide.

A safer approach is sparging, possibly followed by fractional freezing.  Sparging takes advantage of the fact that warm (not hot) air will preferentially evaporate water.

In high concentrations (above 62%), hydrogen peroxide in solution with water will freeze before the water. Below 62%, the water will freeze first, until the liquid solution reaches 62%. Hydrogen peroxide tends to supercool, or cool below its freezing point without freezing. One way to avoid this is to drop a seed crystal of already-frozen peroxide into the supercooled solution to cause it to freeze.

Exact data on the purification of hydrogen peroxide is hard to come by, since most people with experience with this chemical know how hazardous it can be.  They prefer that these amateurs calculate the numbers themselves from the basic properties, such as the freezing point of peroxide and the freezing point of water.  Similar circumstances often require those who would try these experiments to lie about their intentions to the 70% hydrogen peroxide suppliers, since these companies do not wish to be seen as officially supporting hydrogen peroxide rocketry experiments.

According to http://www.astronautix.com/props/h2o2.htm, the situation was different back in 1959, when the approximate United States total production (based on 100% hydrogen peroxide) was 50,000 tons.  In large quantities, 95 per cent hydrogen peroxide then cost approximately $1.00 per kg, while in small drum lots, 98 per cent solutions cost $2.00 per kg, both in 1959 dollars.  Some amateur groups have expressed interest in manufacturing their own peroxide, for their use and for sale in small quantities to others.  It remains to be seen what prices they will set, if they achieve their goals.

"35 percent Food Grade Hydrogen Peroxide", which is 35% pure hydrogen peroxide, has been marketed under names such as "Oxywater" or "H2O2", with claims of medicinal or theraputic value. According to peddlers of the product, it can be diluted and used for "hyper-oxygenation therapy" to cure AIDS, cancer, and many other conditions. Some have claimed that information about these "beneficial" uses of peroxide have been suppressed by the scientific community. The US Food and Drug administration has published a warning against the use of 35% peroxide in the home for any purpose. At least one death, and several serious injuries, have occurred as a result of ingesting this treatment. People who use 35% hydrogen peroxide "water it down" to whatever concentration is needed for the specific situation. Storing 35% makes it convenient to keep enough on hand, which is why people buy it this way. For example, use of 1 cup of 35% H202 in a warm bath is simple (and cheap), where use of 3% H202 would be less convenient (about 11 cups) and more expensive.


External links


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Hydrogen sulfide
(From Wikipedia, the free Encyclopedia)






 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Properties




General





Name
 Hydrogen sulfide


Chemical formula
 H2S


Appearance
 Colourless gas




Physical





Formula weight
 34.1 amu


Melting point
 187 K (-86 °C)


Boiling point
 213 K (-60 °C)


Solubility
 0.33 g in 100g water




Thermochemistry





ΔfH0gas
 -20.5 kJ/mol


ΔfH0liquid
 ? kJ/mol


ΔfH0solid
 ? kJ/mol


S0gas, 1 bar
 205.77 J/mol·K


S0liquid, 1 bar
 ? J/mol·K


S0solid
 ? J/mol·K




Safety



Ingestion
 May cause nausea and vomiting.


Inhalation
 Dangerous, may be fatal. Symptoms are diverse - see reference.


Skin
 May cause severe pain and itching.


Eyes
 May cause burns.


More info
 Hazardous Chemical Database



 
   SI units were used where possible. Unless otherwise stated, standard conditions were used.
   
Disclaimer and references
 
 



The chemical compound hydrogen sulfide (Hydrogen sulphide in British English) H2S is a sulfide compound that has an unpleasant smell; it is responsible for the smell of rotten eggs. This gas can suffocate sewer workers and is often associated with other decay smells in swamps.  Hydrogen sulfide is produced by the breakdown of sulfur-containing proteins and is responsible for much of the foul odor of feces and flatulence.

Hydrogen sulfide occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It can also result from bacterial breakdown of organic matter. It is also produced by human and animal wastes.

Hydrogen sulfide can also result from industrial activities, such as food processing, coke ovens, kraft paper mills, tanneries, and petroleum refineries.

It is an acidic gas which reacts with alkali and metals like silver. This is the reason why silver jewellery turns black when exposed to polluted atmosphere for a long duration. The Silver_sulphide resulting from the reaction is black in colour.

Health effects

Hydrogen sulfide is considered a broad-spectrum poison, meaning it can poison several different systems in the body. Breathing very high levels of hydrogen sulfide can cause death within just a few breaths. There could be loss of consciousness after one or more breaths.

Exposure to lower concentrations can result in eye irritation, a sore throat and cough, shortness of breath, and fluid in the lungs. These symptoms usually go away in a few weeks. Long-term, low-level exposure may result in fatigue, loss of appetite, headaches, irritability, poor memory, and dizziness.

Animal studies showed that pigs that ate food containing hydrogen sulfide had diarrhea after a few days and weight loss after about 105 days.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Hydrogen sulfide."
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List of airports: H
(From Wikipedia, the free Encyclopedia)

List of airports: A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z



H


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List of Biblical names starting with H
(From Wikipedia, the free Encyclopedia)
List of Biblical names

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - Y - Z

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List of books by title: H
(From Wikipedia, the free Encyclopedia)
List of books in alphabetical order by title:

A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z


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List of cities in Germany starting with H
(From Wikipedia, the free Encyclopedia)
List of cities in Germany: A - B - C - D - E - F - G - H  - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z




TownPopulationDistrictBundesland


Haan29,700MettmannNorth Rhine-Westphalia


Hagen209,000--North Rhine-Westphalia


Halle268,400--Saxony-Anhalt


Halle20,500GüterslohNorth Rhine-Westphalia


Hallenberg4,744HochsauerlandNorth Rhine-Westphalia


Haltern36,800RecklinghausenNorth Rhine-Westphalia


Halver17,537Märkischer KreisNorth Rhine-Westphalia


Hamburg1,700,000--Hamburg


Hamelin (Hameln)58,800Hamelin-PyrmontLower Saxony


Hamm181,200--North Rhine-Westphalia


Hanover (Hannover)523,100--Lower Saxony


Hannoversch Münden28,000GöttingenLower Saxony


Harsewinkel23,600GüterslohNorth Rhine-Westphalia


Hattingen58,300Ennepe-RuhrNorth Rhine-Westphalia


Heide21,000DithmarschenSchleswig-Holstein


Heidelberg139,900--Baden-Württemberg


Heilbronn121,000--Baden-Württemberg


Heiligenhaus28,400MettmannNorth Rhine-Westphalia


Heimbach4,600DürenNorth Rhine-Westphalia


Heinsberg41,300HeinsbergNorth Rhine-Westphalia


Helmstedt26,800HelmstedtLower Saxony


Hemer37,185Märkischer KreisNorth Rhine-Westphalia


Hennef42,700Rhein-SiegNorth Rhine-Westphalia


Herdecke25,900Ennepe-RuhrNorth Rhine-Westphalia


Herdorf7,400AltenkirchenRhineland-Palatinate


Herford65,100HerfordNorth Rhine-Westphalia


Herne169,200--North Rhine-Westphalia


Herten66,900RecklinghausenNorth Rhine-Westphalia


Herzogenrath46,900AachenNorth Rhine-Westphalia


Hilchenbach16,600Siegen-WittgensteinNorth Rhine-Westphalia


Hilden56,400MettmannNorth Rhine-Westphalia


Hildesheim106,100HildesheimLower Saxony


Hirschau6,400Amberg-SulzbachBavaria


Hof50,869--Bavaria


Holzminden22,000HolzmindenLower Saxony


Höxter33,100HöxterNorth Rhine-Westphalia


Hoyerswerda55,600--Saxony


Hückelhoven39,000HeinsbergNorth Rhine-Westphalia


Hückeswagen16,400Oberbergischer KreisNorth Rhine-Westphalia


Hürth53,300ErftkreisNorth Rhine-Westphalia


Husum21,000NordfrieslandSchleswig-Holstein


Hüttlingen5,626OstalbkreisBaden-Württemberg



A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of cities in Germany starting with H."
Top     

List of colleges and universities starting with H
(From Wikipedia, the free Encyclopedia)
A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- Y -- Z


  1. Hame Polytechnic

  2. Hogskolen i Bodo

  3. Hogskolen i Hedmark

  4. Hogskolen i Oslo

  5. Hogskolan pa Gotland

  6. Haagse Hogeschool

  7. Hacettepe University

  8. Hachinohe Institute of Technology

  9. Hahnemann University

  10. Hallym University

  11. Halmstad University

  12. Hamilton College

  13. Hamline University

  14. Hampden-Sydney College

  15. Hampshire College

  16. Hampton University

  17. Handelshochschule Leipzig (HHL)

  18. Hangzhou University

  19. Hankook University of Foreign Studies

  20. Hanover College

  21. Hanyang University

  22. Hanzehogeschool

  23. Harbin Engineering University

  24. Harbin Institute of Technology

  25. Harding University

  26. Hartland Institute of Health and Education

  27. Harvard Graduate School of Education

  28. Harvard University (Cambridge, Massachusetts)

  29. Harvey Mudd College

  30. Hastings College

  31. Hastings College of Law

  32. Hautes Etudes Commerciales

  33. Haverford College

  34. Hawaii Pacific University

  35. Heald Institute Of Technology

  36. Hebrew College

  37. Hebrew University of Jerusalem

  38. Heidelberg College

  39. Heinrich-Heine-Universitat Dusseldorf

  40. Helsinki Business Polytechnic

  41. Helsinki School of Economics

  42. Helsinki University of Technology

  43. Henderson State University

  44. Hendrix College

  45. Heriot-Watt University

  46. Heritage College

  47. University of Hertfordshire

  48. Hesston College

  49. High Point University

  50. Higher Colleges of Technology

  51. Hill College

  52. Hillsdale College

  53. Hiram College

  54. Hirosaki University

  55. Hiroshima City University

  56. Hiroshima Institute of Technology

  57. Hiroshima Shudo University

  58. Hiroshima University

  59. Hiroshima-Denki Institute of Technology

  60. Hitotsubashi University

  61. Hobart and William Smith Colleges

  62. Hochschule fur Architektur und Bauwesen Weimar

  63. Hochschule fur Druck Stuttgart

  64. Hochschule fur Musik und Darstellende Kunst Mozarteum

  65. Hochschule fur Musik und Darstellende Kunst in Graz

  66. Hochschule fur Technik und Wirtschaft Dresden

  67. Hochschule fur Technik und Wirtschaft Mittweida

  68. Hochschule fur Technik und Wirtshaft Zwickau (FH)

  69. Hochschule fur Technik, Wirtschaft und Kultur Leipzig

  70. Hochschule fur Technik,Wirtshaft, und Sozialwesen Zittau/Gorlitz(FH)

  71. Hocking College

  72. Hofstra University

  73. Hogeschool Eindhoven

  74. Hogeschool van Amsterdam

  75. Hogeschool van Utrecht

  76. Hohai University

  77. Hokkaido University

  78. Hokkaido University of Education

  79. Holland College

  80. Holyoke Community College

  81. Hong Kong Baptist University

  82. Hong Kong Polytechnic University

  83. Hong Kong University of Science and Technology

  84. Honolulu Community College

  85. Hood College

  86. Hope College

  87. Houghton College

  88. Houston Community College System

  89. Howard Community College

  90. Howard University

  91. HuaFan College of Humanitites and Technology

  92. Huazhong University of Science and Technology

  93. Huazhong University of Science and Technology

  94. Huddersfield University

  95. Hudson Valley Community College

  96. Humber College of Applied Arts and Technology

  97. Humboldt State University 

  98. Humboldt-University, Berlin

  99. Hunan Agricultural University

  100. Hung-Kuang College of Nursing

  101. Huntingdon College

  102. Huntington College
    

See also : Colleges and universities
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of colleges and universities starting with H."
Top     

List of Japanese authors:H
(From Wikipedia, the free Encyclopedia)
List of Japanese authors


Top     

List of people by name: H
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha - Hb -
Hc - Hd -
He - Hf -
Hg - Hh -
Hi - Hj -
Hk - Hl -
Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of people by name: H."
Top     

List of people by name: Ha
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå -
Hab-Haf -Hag-Hah -
Hai-Hak - Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of people by name: Ha."
Top     

List of people by name: Haa & Hå
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha - 
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå -
Hab-Haf -Hag-Hah -
Hai-Hak - Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Haa/Hå


Top     

List of people by name: Hab-Haf
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf -
Hag-Hah -
Hai-Hak - Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hab


Hac


Had


Hae


Haf


Top     

List of people by name: Hag-Hah
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah -
Hai-Hak - Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hag


Hah


Top     

List of people by name: Hai-Hak
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak -
Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hai


Hak


Top     

List of people by name: Hal
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal -
Ham - Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hala-Halk


Hall


Halm-Halz


Top     

List of people by name: Ham
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham -
Han -
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Ham


Top     

List of people by name: Han
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - 
Hao-Haq - Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hana-Hann


Hans-Hanz


Top     

List of people by name: Hao-Haq
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har -
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of people by name: Hao-Haq."
Top     

List of people by name: Har
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har - 
Has-Hat - Hau-Hav -
Haw-Hax - Hay-Haz


Hara


Harb-Harc


Hard


Hare-Harl


Harm


Harn-Harp


Harr


Harris


Harrison


Harry


Hart


Haru-Hary


Top     

List of people by name: Has-Hat
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har - Has-Hat - 
Hau-Hav -
Haw-Hax - Hay-Haz


Has


Hat


Top     

List of people by name: Hau-Hav
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har - Has-Hat - 
Hau-Hav - 
Haw-Hax - Hay-Haz


Hau


Hav


Top     

List of people by name: Haw-Hax
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har - Has-Hat - 
Hau-Hav - 
Haw-Hax - Hay-Haz


Haw


Top     

List of people by name: Hay-Haz
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z
 
Ha -
Hb-Hd -He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz

Haa/Hå - Hab-Haf - 
Hag-Hah - Hai-Hak - 
Hal - Ham - 
Han - Hao-Haq - 
Har - Has-Hat - 
Hau-Hav - Haw-Hax - 
Hay-Haz 


Hay


Haz


Top     

List of people by name: He-Hh
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha -
Hb-Hd -
He-Hh -
Hi - Hj -
Hk - Hl -
Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Hea-Hec


Hed-Hel


Hem


Hen


Hend-Henq
 

Henr


Henry


Hens-Henz


Hep


Her


Top     

List of people by name: Hi-Hm
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha -
Hb-Hd -
He-Hh -
Hi-Hm -
Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz



Hi


Hl


Top     

List of people by name: Hn
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha -
Hb-Hd -
He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of people by name: Ho
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha -
Hb-Hd -
He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of people by name: Hr
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha -
Hb-Hd -
He-Hh -
Hi-Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of people by name: Hs
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha - Hb -
Hc - Hd -
He - Hf -
Hg - Hh -
Hi - Hj -
Hk - Hl -
Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of people by name: Hu
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha - Hb -
Hc - Hd -
He - Hf -
Hg - Hh -
Hi - Hj -
Hk - Hl -
Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of people by name: Hy
(From Wikipedia, the free Encyclopedia)
List of people by name:
A - B -
C - D -
E - F -
G - H -
I - J -
K - L -
M - N -
O - P -
Q - R -
S - T -
U - V -
W - X -
Y - Z

Ha - Hb -
Hc - Hd -
He - Hf -
Hg - Hh -
Hi - Hj -
Hk - Hl -
Hm - Hn -
Ho - Hp -
Hq - Hr -
Hs - Ht -
Hu - Hv -
Hw - Hx -
Hy - Hz


Top     

List of rare diseases starting with H
(From Wikipedia, the free Encyclopedia)
This list of rare diseases was originally taken from the
NIH public domain resource at http://ord.aspensys.com/asp/diseases/diseases.asp .

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Top     

List of songs by name: H
(From Wikipedia, the free Encyclopedia)
List of songs by name:
0 - A - 
B - C - 
D - E - 
F - G - 
H - I - 
J - K - 
L - M - 
N - O - 
P - Q - 
R - S - 
T - U - 
V - W - 
X - Y - 
Z


  1.  "Happy Birthday" - unknown

  2.  "Hawai'i pono'i" - written by King David Kalakaua in 1874, with music by Henry Berger; state song of Hawaii

  3.  "Heaven" - Bryan Adams

  4.  "Heaven is a Place on Earth" - Belinda Carlisle

  5.  "Here I Am" - Bryan Adams

  6.  "Hey Hey What Can I Do" - Led Zeppelin

  7.  "Hey You" - Pink Floyd

  8.  "High Hopes" - The Division Bell by Pink Floyd

  9.  "Highway 29" - The Ghost of Tom Joad by Bruce Springsteen

  10.  "Hit Me Baby One More Time" - Britney Spears
    Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of songs by name: H."
Top     

Methyl group
(From Wikipedia, the free Encyclopedia)
In chemistry a methyl-group is an Alkyl functional group with the formula


-CH3


This hydrocarbon unit can be found in many organic compounds, like biodiesel (methyl ester).
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Methyl group."
Top     

Poker jargon starting with H
(From Wikipedia, the free Encyclopedia)
Poker jargon:


A - B - C - D - E - F -   G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z


; half bet rule

 In some casinos, the rule that placing chips equal to or greater than half the normal bet amount beyond the amount required to call constitutes a commitment to raise the normal amount. For example, in a game with a $4 fixed limit, a player facing a $4 opening bet who places $6 in the pot is deemed to have raised, and must complete his bet to $8. The alternative is the "full bet rule".


; half kill

 A kill for less than double the normal limits. For example, a $6 game may have a kill for $9 rather than the usual $12.


; half-pot limit

 A betting structure resembling pot limit, but which allows maximum raises of half the amount in the pot rather than the full amount.


; hammer

  1.  To bet and raise aggressively. Nora kept hammering, so I folded.

  2.  "Having the hammer" is being in last position, especially head up. You've got the hammer; I check to you.
    

; hand

  1.  The set of cards played by one player.

  2.  A single instance of a game of poker, begun by shuffling the cards and ending with the award of a pot. Also called a "deal" (though both terms are ambiguous).
    

; hand for hand

 In tournament play, the act of equalizing the number of hands played at two or more tables by waiting for slower tables to finish each hand before beginning the next hand on every table.  This is usually done to ensure an accurate finishing order to distribute prize money.


; hard

  1.  Aggressive and uncompromising, said of one's play. Jim played me hard all night; I could never get a break.

  2.  Chips, as opposed to paper money. I gave the floorman $100 for $50 hard and $50 soft.
    

; head up, heads up

 Playing against a single opponent. After Lori folded, Frank and I were head up for the rest of the hand.


; high, high hand

 The best hand using traditional poker hand values, as opposed to lowball. Used especially in high-low split games.

; high card

  1.  A no pair hand, ranked according to its highest-ranking cards.

  2.  To defeat another player by virtue of high-ranking cards, especially a kickers.

  3.  To randomly select a player for some purpose by having each draw one card, the highest of which is selected (for example, to decide who deals first). When all the players get here, we'll high card for the button. Often high card by suit is used for this purpose.
    

; high-low, high-low split

 Any of several games in which the pot is divided between the player with the best conventional poker hand and the best lowball hand.


; high society

 Large-denomination chips. Also "society".


; hit and run

 To play for a short time, make money, and leave. Also called "chopping" a game.


; hog, hogger

 To win all of the pot in a split-pot game, for example, by having both the best high hand and best low hand simulataneously. Also called "scooping" the pot.


; hole, hole card

  1.  Face-down cards. I think Willy has two more queens in the hole.

  2.  A seat, often preceded by a number relative to the button. Sara opened from the 2-hole.
    

; Hollywood

 Overt acting to deceive other players. Karl had a big smile when he bet, but it seemed too Hollywood to me, so I called anyway.


; hop the fence

 The enter the pot with a cold call.


; horse

 A player financially backed by someone else. I lost today, but Larry was my horse in the stud game, and he won big.


; H.O.R.S.E.

 A combination game with five games played in rotation: Texas hold 'em, Omaha hold'em, razz, seven-card stud, and eight-or-better seven-card stud high-low.  Other combinations of the letters are often seen as well: S.H.O.E., H.O.E., etc.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Poker jargon starting with H."
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Proton
(From Wikipedia, the free Encyclopedia)












In physics, the proton is a subatomic particle with a positive fundamental electric charge of 1.6 × 10-19 coulomb, a mass of 938 MeV (1.6726231 × 10-27 kg, or about 1800 times that of an electron) and a half-life of about 1033 years. 
The nucleus of the most common isotope of the hydrogen atom, H, is a single proton.  The nuclei of other atoms are composed of neutrons and protons held together by the strong nuclear force. The number of protons in the nucleus determines the chemical properties of the atom and what chemical element it is. 

Protons are classified as baryons and are composed of two up quarks and one down quark, which are also held together by the strong nuclear force, mediated by gluons.

Because the electromagnetic force is many [[order of magnitude|orders
of magnitude]] stronger than the 
gravitational force, the charge on the proton must be equal to the charge on the electron, 
otherwise the net repulsion of having
an excess of positive or negative charge (depending
on which charge was numerically greater - atoms would not be electrically neutral) would
cause a noticeable expansion effect on the universe, and
indeed any gravitationally aggregated matter (planets,
stars, etc.).  It is taken that the positron (antielectron) has the same magnitude charge as the electron but opposite in sign; the same applies for the antiproton and proton.

In chemistry and biochemistry, the term proton may refer to the hydrogen ion in aqueous solution (in other words, the hydronium ion). In this context, a proton donor is an acid and a proton acceptor a base (see acid-base reaction theories).

See also: particle physics, subatomic particle, chemistry, proton decay, neutron, proton-proton chain, proton pump inhibitor.


External Links



For the Russian rocket design, see Proton (rocket).

For the Malaysian automobile manufacturer, see Proton (car).
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Proton."
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Sulphuric acid
(From Wikipedia, the free Encyclopedia)






 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Properties




General





Name
 Sulfuric acid 


Chemical formula
 H2SO4


Appearance
 Colourless liquid




Physical





Formula weight
 98.1 amu


Melting point
 283 K (10 °C)


Boiling point
 610 K (337 °C)


Density
 1.8 ×103 kg/m3


Solubility
 miscible




Thermochemistry





ΔfH0liquid
 -814 kJ/mol


S0liquid, 1 bar
 19 J/mol·K




Safety



Ingestion
 Severe and permanent damage may result.


Inhalation
 Very dangerous, possibly fatal. Long-term effects known.


Skin
 Causes burns.


Eyes
 Causes burns.


More info
 Hazardous Chemical Database



 
   SI units were used where possible. Unless otherwise stated, standard conditions were used.
   
Disclaimer and references
 
 



Sulphuric acid (American English: Sulfuric), H2SO4, is a strong mineral acid (not an organic acid). It can form any concentration in water. The old name for sulphuric acid is oil of vitriol. When high concentrations of SO3 are added when making the acid, a solution of SO3 in H2SO4 results. This is called fuming sulphuric acid or Oleum or Nordhausen acid. 

Sulphuric acid has many applications, including in many chemical reactions and production processes. It is the most widely used chemical. Principal uses include fertilizer manufacturing, ore processing, chemical synthesis, wastewater processing and oil refining. 

In combination with nitric acid it forms the nitronium ion, which is used in the nitration of compounds. The process of nitration is used to manufacture a great many explosives, including trinitrotoluene, nitroglycerine, and guncotton. It is also the acid used in lead-acid batteries, and so is sometimes known as battery acid.

The energy of the hydration reaction with sulphuric acid is highly exothermic, and if water is added to concentrated sulphuric acid it can boil. Always add the acid to the water rather than the water to the acid. Note that part of this problem is due to the relative densities of the two liquids. Water is less dense than sulfuric acid and will tend to layer above the acid, and not mix well, if added to the acid.

Because the hydration of sulfuric acid is thermodynamically favourable, sulphuric acid is an excellent dehydration agent, and is used to prepare many dried fruits.

When in the atmosphere it is part of many chemicals which make up acid rain.


History of sulfuric acid

Sulfuric acid was known to medieval alchemists under of variety of names including oil of vitriol and spirit of vitriol.  These substances were produced by the dry distillation of minerals including ferrous sulfate heptahydrate, FeSO4 • 7 H2O, called green vitriol, and cupric sulfate pentahydrate, CuSO4 • 5 H2O, called blue vitriol.  When heated, these compounds decompose to ferrous and cupric oxides, respectively, giving off water and sulfur trioxide, which combine to produce a dilute solution of sulfuric acid.  Preparations like these have been ascribed to alchemists including the 12th-century Arab Abou Bekr al-Rhases and the 13th-century German Albertus Magnus.

In the 17th century, the German-Dutch chemist Johann Glauber prepared sulfuric acid by burning sulfur together with saltpeter (potassium nitrate, KNO3), in the presence of steam.  As the saltpeter decomposes, it oxidizes the sulfur to SO3, which combines with water to produce sulfuric acid.  In 1736, Joshua Ward, a London pharmacist, used this method to begin the first large-scale production of sulfuric acid.

In 1746 in Birmingham, John Roebuck began producing sulfuric acid this way in lead-lined chambers, which were stronger, less expensive, and could be made larger than the glass containers which had been used previously.  This lead-chamber process allowed the effective industrialization of sulfuric acid production, and with several refinements remained the standard method of production for almost two centuries.

John Roebuck's sulfuric acid was only about 35-40% sulfuric acid, and later refinements in the lead-chamber process improved this to 78%.  However, the manufacture of some dyes and other chemical processes require a more concentrated product, and throughout the 18th century, this could only be made by dry distilling minerals in a technique similar to the original alchemical processes.  Pyrite (iron disulfide, FeS2) was heated in air to yield ferrous sulfate, FeSO4, which was oxidzied by further heating in air to form ferric sulfate, Fe2(SO4)3, which when heated to 480°C decomposed to ferric oxide and sulfur trioxide, which could be passed through water to yield sulfuric acid in any concentration.  The expense of this process prevented the large-scale use of concentrated sulfuric acid.

In 1831, the British merchant Peregrine Phillips patented a far more economical process for producing sulfur trioxide and concentrated sulfuric acid.  In this process sulfur dioxide, SO2, produced by roasting either sulfur or pyrite in air, is combined with additional air and passed over a platinum catalyst at high temperatures, where it combines with oxygen from the air to produce nearly pure SO3.  Even so, there was little demand for highly concentrated sulfuric acid at the time, and the first sulfuric acid plant using this contact process was not built until 1875 in Freiburg, Germany.

The development of the less expensive and less easily contaminated vanadium pentoxide (V2O5) catalyst by BASF in Gemany in 1915, combined with increasing demand for concentrated sulfuric acid by the chemical industry, has led to the gradual replacement of the lead-chamber process by the contact process.  In 1930, sulfuric acid produced by the contact process accounted for only 25% of sulfuric acid production, while today nearly all sulfuric acid is manufactured in this way.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Sulphuric acid."
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Water
(From Wikipedia, the free Encyclopedia)












nah:Atl
nds:Water



simple:Water








 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Properties




General





Name
 Water


Chemical formula
 H2O


Appearance
 Colourless liquid




Physical





Formula weight
 18.01528 amu


Melting point
 273 K (0 °C)


Boiling point
 373 K (100 °C)


Critical temperature
 674 K


Critical Pressure
 22.1x10^6?? Pa


Density
 1.0 ×103 kg/m3




Thermochemistry





ΔfH0gas
 -241.83 kJ/mol


ΔfH0liquid
 -285.83 kJ/mol


ΔfH0solid
 -291.83 kJ/mol


S0gas, 1 bar
 188.84 J/mol·K


S0liquid, 1 bar
 69.95 J/mol·K


S0solid
 41 J/mol·K




Safety



Ingestion
 Necessary to life; excessive consumption can cause headache, confusion, and cramps, and can be fatal in athletes


Inhalation
 Non-toxic. Can dissolve surfactant of lungs. Suffocation in water is called drowning.


Skin
 Prolonged immersion may cause flaking (desquamation).


Eyes
 Not dangerous.



 
   SI units were used where possible. Unless otherwise stated, standard conditions were used.
   
Disclaimer and references
 
 



Water is a chemical compound which is liquid at room temperature and standard pressure. It has the chemical formula H2O, meaning that one molecule of water is composed of 2 hydrogen atoms and one oxygen atom. Water is found almost everywhere on earth and is required by all known life. About 70% of the earth's surface is covered by water.  


General

The solid state of water is known as (water) ice; the gaseous state is known as steam. The units of temperature (formerly the degree Celsius and now the Kelvin) are defined in terms of the triple point of water, 273.16 K (0.01 °C) and 611.2 Pa, the temperature and pressure at which solid, liquid, and gaseous water coexist in equilibrium.

At temperatures greater than 647 K and pressures greater than 22.064 MPa, a collection of water molecules assumes a supercritical condition, in which liquid-like clusters float within a vapor-like phase.

A body of water is a term for an ocean, sea, lake, river, stream, canal, pond, or the like. See water (resource) for information about fresh water supplies. See also beach, ferry, pier.

Chemists sometimes jokingly refer to water as dihydrogen monoxide or DHMO (see http://www.dhmo.org/), the systematic covalent name of this molecule, especially in parodies of chemical research that call for this "lethal chemical" to be banned. The systematic acid name of water is hydroxic acid or hydroxilic acid, although these terms are rarely used.


The dipolar nature of water

An important feature of water is its polar nature. The water molecule forms an angle, with hydrogen atoms at the tips and oxygen at the vertex. Since oxygen has a higher electronegativity than hydrogen, the side of the molecule with the oxygen atom has a partial negative charge, relative to the hydrogen side. A molecule with such a charge difference is called a dipole. The charge differences cause water molecules to be attracted to each other (the relatively positive areas being attracted to the relatively negative areas) and to other polar molecules. This attraction is known as hydrogen bonding.

This relatively weak (relative to the covalent bonds within the water molecule itself) attraction results in properties such as a very high boiling point, because a lot of heat energy is necessary to break the hydrogen bonds between molecules, and also a large specific heat capacity.

Also due to hydrogen bonding, water molecules have the peculiar property that their density in the liquid state is higher than in the crystalline (solid) state. 
The highest density of water occurs in the liquid form at a temperature of 4 °C. This has the effect that the water at the bottom of lakes in winter typically has a temperature of 4 °C, allowing fish to survive. 
Another consequence is that ice will melt if sufficient pressure is applied.


Water as a solvent

Water is also a good solvent due to its polarity. When an ionic or polar compound enters water, it is surrounded by water molecules. The relatively small size of water molecules typically allows many water molecules to surround one molecule of solute. The partially negative dipoles of the water are attracted to positively charged components of the solute, and vice versa for the positive dipoles. 

In general, ionic and polar substances such as acids, alcohols, and salts are easily soluble in water, and nonpolar substances such as fats and oils are not. 
Nonpolar molecules stay together in water because it is energetically more favorable for the water molecules to hydrogen bond to each other than to engage in van der Waals interactions  with nonpolar molecules.

An example of an ionic solute is table salt; the sodium chloride, NaCl, separates into Na+ cations and Cl- anions, each being surrounded by water molecules. 
The ions are then easily transported away from their crystalline lattice into solution. 
An example of a nonionic solute is table sugar. 
The water dipoles hydrogen bond to the dipolar regions of the sugar molecule and allow it to be carried away into solution.

The solvent properties of water are vital in biology, because many biochemical reactions take place only in solution (e.g., reactions in the cytoplasm and blood).


Cohesion and surface tension

The strong hydrogen bonds give water a high cohesiveness and, consequently, surface tension. This is evident when small quantities of water are put onto a nonsoluble surface and the water stays together as drops. This feature is important when water is carried through xylem up stems in plants; the strong intermolecular attractions hold the water column together, and prevent tension caused by transpiration pull.  
Other liquids with lower surface tension would have a higher tendency to "rip", forming vacuum or air pockets and rendering the xylem vessel inoperative.


Conductivity

Pure water is actually an insulator, meaning that it does not conduct electricity well. Because water is such a good solvent, it often has some solute dissolved in it, most frequently salt. 
If water has such impurities, then it can conduct electricity well. 


Electrolysis



Water can be split into its constituent elements, hydrogen and oxygen, by passing a current through it. This process is called electrolysis. 
Water molecules naturally disassociate into H+ and OH- ions, which are pulled toward the cathode and anode, respectively. 
At the cathode, two H+ ions pick up electrons and form H2 gas. At the anode, four OH- ions combine and release O2 gas, molecular water, and four electrons. The gases produced bubble to the surface, where they can be collected.


Reactivity

Chemically, water is amphoteric: able to act as an acid or base. Occasionally the term hydroxic acid is used when water acts as an acid in a chemical reaction. At a pH of 7 (neutral), the concentration of hydroxide ions (OH-) is equal to that of the hydronium (H3O+) or hydrogen ions (H+) ions. If the equilibrium is disturbed, the solution becomes acidic (higher concentration of hydronium ions) or basic (higher concentration of hydroxide ions).


Purifying water

Purified water is needed for many industrial applications, as well as for consumption. Humans require water that does not contain too much salt or other impurities. Common impurities include chemicals or harmful bacteria.  Some solutes are acceptable and even desirable for perceived taste enhancement. Water that is suitable for drinking is termed potable water.  

Six popular methods for purifying water are:


  1. Filtering: Water is passed through a sieve that catches small particles. The tighter the mesh of the sieve, the smaller the particles must be to pass through. Filtering is not sufficient to completely purify water, but it is often a necessary first step, since such particles can interfere with the more thorough purification methods.

  2. Boiling: Water is heated to its boiling point long enought to inactivate or kill microorganisms that normally live in water at room temperature. Boiling does not remove solutes that have a lower boiling point than the solution, and in fact increases their concentration.

  3. Carbon filtering: Charcoal, a compound that contains a high concentration of carbon, absorbs many compounds, including toxic compounds. Water is passed through activated charcoal to remove such contaminants. This method is most commonly used in household water filters and fish tanks.

  4. Distilling: Distillation involves boiling the water to produce water vapor. The water vapor then rises to a cooled surface where it can condense back into a liquid and be collected. Because the solutes are not normally vaporized, they remain in the boiling solution. Even distillation does not completely purify water, because of contaminants with similar boiling points and droplets of unvaporized liquid carried with the steam. Still, 99.9% pure water can be obtained by distillation.

  5. Reverse osmosis: Mechanical pressure is applied to an impure solution to force pure water through a semi-permeable membrane. The term is reverse osmosis, because normal osmosis would result in pure water moving in the other direction to dilute the impurities. Reverse osmosis is theoretically the most thorough method of large-scale water purification available, although perfect semi-permable membranes are difficult to create.

  6. Ion exchange chromatography: In this case, water is passed through a charged resin column that has side chains that trap calcium, magnesium, and other heavy metal ions. In many laboratories, this method of purification has replaced distillation, as it provides more quickly a high volume of very pure water. Water purified in this way is called deionized water.
    

Mythology

Water is one of the four classical elements along with fire, earth and air, and was regarded as the ylem, or basic stuff of the universe. Water was considered cold and moist. In the theory of the four bodily humours, water was asssociated with phlegm. 

Water was also one of the Chinese five elements along with air, fire, wood, and metal.


Water rights and development

In the United States water law is divided between two legal doctrines: riparian water rights, used in the eastern and southern states where there is an abundance of water and the appropriation doctrine (or Colorado doctrine) used in the arid western states.

UNESCO's World Water Development Report (WWDR, 2003) from its World Water Assessment Program indicates that in the next 20 years the world is facing an unprecedented lack of drinking water.  
The quantity of water available to everyone is predicted to decrease by 30%. 
The causes are contamination, global warming and political problems.

40% of the world's inhabitants have insufficient fresh water for minimal hygiene. 
More than 2.2 million people died in 2000 from illnesses related to the consumption of contaminated water.

The report indicates large global disparities in the raw volume of available water: from 10 m³ per person per year in Kuwait to 812.121 [m³?] in French Guiana.   
However, richer countries such as Kuwait can more easily cope with low water availability.


Body of water



See also


External links


Top     
Abbreviations & Acronyms: H
The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted.
EntrySourceExpressionField
H
DanishDosisaekvivalentNuclear Energy & Physics, Medicine
H
DutchSkagN/A
H
EnglishHorseN/A
H
FrenchMarie-jeanneN/A
H
GermanHarryN/A
H
ItalianIdrogenoChemistry
H
LatinHydrogeniumChemistry
H
PortugueseHidrogénioChemistry
EAR and HEnglishEast African Railways and Harbours AdministrationTransportation
Source: compiled by the editor, based on several corpora (additional references).
Top     
Synonyms: H
Synonyms: atomic number 1 (n), diacetylmorphine (n), henry (n), heroin (n), horse (n), hydrogen (n), junk (n), scag (n), shit (n), smack (n). (additional references)
Top     
Crosswords: H
English words defined with "H": Aitch, Aspirated ♦ Word square. (references)
Specialty definitions using "H": absolute daily range, acid soil ♦ Biot number, Briggs equalizer ♦ Complement 3c, Complement 3d, Complement Factor H, CONS, cutting theorem ♦ De Broglie wavelength ♦ E-H tee, exponential atmosphere, extended Euclid's algorithm ♦ Fluid Milk Promotion Act of 1990, foreshift, From hence ♦ geocerite, GEOMAGNETIC ELEMENTS, geopotential height, Gopher object type, Gordon's rule, Greenwell formula, grids, Gunpowder ♦ hc, Hempe, hybrid T ♦ inline ♦ kilowatt-hour ♦ Language H, Leonora, lifting beam, lifting eyes of the heavier moulding boxes, linear function, long-running thermal precipitator ♦ MAGNETIC BAY, magnetic induction ♦ N. H, Notarica, Nusselt number ♦ Oldham-Wheat lamp ♦ Planck equation, PLANCK'S, positioned channel, priority inversion ♦ radio horizon, Real Programmers Don't Use Pascal, rotating Reynolds number ♦ salts, Simbal breathing apparatus, sling beam, solodisation, solodization, solotization, spontaneous emission, Stanton number, SUNSPOT GROUP CLASSIFICATION ♦ true width. (references)
Non-English Usage: "H" is also a word in the following languages with English translations in parentheses.
German (b, h), Latin (Hydrogen), Portuguese (Hydrogen), Spanish (h), Swedish (b), Turkmen (still).
Top     
Modern Usage: H
DomainUsage
Screenplays
H and G. (Sleepless in Seattle; writing credit: Nora Ephron)
Movie/TV Titles
H Is for House (1973)
Operación H (1963)
H Pagida (1962)
R.C.A.F. Nuclear Defence: H Hour Now (1959)
C 12 H 22 O 11 - Auf den Spuren des Lebens (1958)
Source: compiled by the editor from various references; see credits.
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Commercial Usage: H
DomainTitle
References
  • H & M Hennes & Mauritz AB (publ): International Competitive Benchmarks and Financial Gap Analysis (reference)
  • H & R Johnson Berhad: International Competitive Benchmarks and Financial Gap Analysis (reference)
  • H & R REAL ESTATE INVT TR: International Competitive Benchmarks and Financial Gap Analysis (reference)
  • H Power Corp.: International Competitive Benchmarks and Financial Gap Analysis (reference)
  • W H Smith PLC: International Competitive Benchmarks and Financial Gap Analysis (reference)
    (more reference examples)
  
Books
  
Periodicals
  
Theater & Movies
  • Crystal Energy Grid & Remote H (reference)
  • Most Memorable Moments in Superbowl H (reference)
    (more DVD examples; more video examples)
  
Music
  • Stravinsky: L'Histoire Du Soldat/Octet For Wind Instruments/Milhaud: La Création Du Monde/Bernstein: Afterthought/I H (reference)
    (more classical music examples; more popular music examples)
  
High Tech
Source: compiled by the editor from various references; see credits.
Top     
Image Slideshow: H
Illustrations:
H
More pictures...
Top     
Photo Album: H
ThumbnailDescription & CreditThumbnailDescription & Credit
Human metastatic melanoma cells stained with an H & E stain and magnified to 320x. Credit: Unknown photographer/artist.
Double immunodiffusion in agar gel illustrating the exoantigen method.  H Ab - antibodies to H. capsulatum; H ag - histoplasmin or fungal extract; B ag - Blastomyces dermatitidis extract. Credit: CDC.
An F-16 flying in support of Operation Northern Watch.  The F-16 Fighting Falcon is a compact, multirole fighter aircraft. It is highly maneuverable and has proven itself in air-to-air combat and air-to-surface attack. It provides a relatively low-cost, h.
Technical Sgt. Frank Lubas, 2nd Security Forces Squadron, Barksdale Air Force Base, La., observes the skill of an Air Force Special Operations Command competitor from his perch in the range safety tower during the pistol phase of Defender Challenge 2000 h.
Les philantropes du jour h D. Credit: National Library of Medicine.
J. Earle Ash / Wm H Feldman. Credit: National Library of Medicine.
Man on horseback pointing, rope, and letter H. Credit: Library of Congress.
Donkey head idol being worshipped and letter H. Credit: Library of Congress.
Corcoran House, H St. and Conn. Ave., N.W., Washington, D.C., Northeast corner]  / p. Credit: Library of Congress; photo by E.B. Thompson, Wash., D.C..
H bomb? Building an H-bomb gives us powerful insurance that an enemy will not use one against us  / drawings by Ray Pioch. Credit: Library of Congress.
Source: pictures compiled by the editor from various references; see picture credits.
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Digital Photo Gallery: H
 
"Deaf Alphabet - H" by Luis Alves
Commentary: "Deaf Alphabet . One Hand  ---------------------------   Notice: You can use this image, but please send me an e-mail if you use it, I really like to know when and where it's used, thanks :-)."		"Shary Chapel" by Jonathan Searfoss
Commentary: "Shary Chapel is the final resting place for developer/pioneer John H. Shary in south Texas."

Source: photographs selected by the editor, with permission from the photographers.
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Non-Fiction Usage: H
SubjectTopicQuote
Health
Patients with Hb H disease require care by a hematologist. (references)
Asian patients with alpha thalassemia trait need counseling for the potential reproductive risk of Hb H disease or hydrops fetalis. (references)
LDLs are the part of cholesterol that enables fats to attach to the walls of arteries, narrowing and, eventually, blocking them. HDLs (think of H as in healthy) help keep the arteries clear, so that blood can flow freely. (references)
Business
The city of Buenos Aires is expanding its undergroung lines B, D and E, and starting a new H line, totalling about 15 km of tunnels and tracks. (references)
Trade
Morocco
Contact: Multilateral Investment Guarantee Agency, 1818 H Street, NW, Washington, DC 20433, Guarantees Dept. (references)
Egypt
For further information and assistance contact the U.S. Commerce Department's Commercial Service Liaison Staff, Office of the U.S. Executive Director, The World Bank, 1818 H Street NW, Washington DC 20433, USA. (references)
Morocco
For more information on any of these services in the U.S., contact MDBO at (202) 482-3399 or fax (202) 273-0927 or the Commercial Service Liaison Staff, Office of the U.S. Executive Director, the World Bank, 1818 H Street NW, Washington DC 20433, USA. (references)
Lexicography
Devil's Dictionary
GUNPOWDER, n.  An agency employed by civilized nations for the settlement of disputes which might become troublesome if left unadjusted.  By most writers the invention of gunpowder is ascribed to the Chinese, but not upon very convincing evidence.  Milton says it was invented by the devil to dispel angels with, and this opinion seems to derive some support from the scarcity of angels.  Moreover, it has the hearty concurrence of the Hon. James Wilson, Secretary of Agriculture. Secretary Wilson became interested in gunpowder through an event that occurred on the Government experimental farm in the District of Columbia.  One day, several years ago, a rogue imperfectly reverent of the Secretary's profound attainments and personal character presented him with a sack of gunpowder, representing it as the sed of the Flashawful flabbergastor, a Patagonian cereal of great commercial value, admirably adapted to this climate.  The good Secretary was instructed to spill it along in a furrow and afterward inhume it with soil.  This he at once proceeded to do, and had made a continuous line of it all the way across a ten-acre field, when he was made to look backward by a shout from the generous donor, who at once dropped a lighted match into the furrow at the starting-point.  Contact with the earth had somewhat dampened the powder, but the startled functionary saw himself pursued by a tall moving pillar of fire and smoke and fierce evolution.  He stood for a moment paralyzed and speechless, then he recollected an engagement and, dropping all, absented himself thence with such surprising celerity that to the eyes of spectators along the route selected he appeared like a long, dim streak prolonging itself with inconceivable rapidity through seven villages, and audibly refusing to be comforted.  "Great Scott! what is that?" cried a surveyor's chainman, shading his eyes and gazing at the fading line of agriculturist which bisected his visible horizon.  "That," said the surveyor, carelessly glancing at the phenomenon and again centering his attention upon his instrument, "is the Meridian of Washington." H
Source: compiled by the editor from ICON Group International, Inc.; see credits.
Top     
Usage Frequency: H
"H" is generally used as an alphabetical symbol -- approximately 74.51% of the time. "H" is used about 5,459 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted)
Parts of SpeechPercentUsage per
100 Million Words		Rank in English
Alphabetical Symbol74.51%4,0682,418 
Noun (proper)19.74%1,0786,975 
Unclassified Items5.75%31416,289 
                    Total100.00%5,459N/A
Source: compiled by the editor from several corpora; see credits.
Top     
Usage in Company Names: H
CountryNameCountryName
Australia
Washington H Soul Pattinson and Company Limited
Canada
H & R REAL ESTATE INVT TR
Malaysia
H & R Johnson Berhad
Sweden
H & M Hennes & Mauritz AB (publ)
United Kingdom
W H Smith PLC
USA
H Power Corp.
 (more examples...)  
Source: compiled by the editor from Icon Group International, Inc.
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Expressions: H
Expressions using "H": appendix H ♦ Cape May Court H ♦ Complement Factor H ♦ Gee H ♦ H agilis ♦ H albicilla ♦ H alpina ♦ H Americanus ♦ H Androsoemum ♦ H arboreus ♦ H aspersa ♦ H auricula ♦ H aurolineatus ♦ H Bachmani ♦ H bend ♦ H Bennettii ♦ H bidens ♦ H biguttatus ♦ h bomb ♦ H Brucei ♦ H brunnea ♦ H c ♦ H c1 ♦ H c2 ♦ H Campechianum ♦ H Canadense ♦ H candidus ♦ H capensis ♦ H cerphalotes ♦ H comosa ♦ H coronarium ♦ H Courbaril ♦ H dot three twenty ♦ H edulis ♦ h eed ♦ H epoch ♦ H equina ♦ H griseus ♦ H helix ♦ H hortensis ♦ h hour ♦ H ichneumon ♦ H inflata ♦ H lanatum ♦ H leucocephalus ♦ H Liberiencis ♦ H M S ♦ H mode ♦ H niger ♦ H officinalis ♦ H orientalis ♦ H ostralegus ♦ H palliatus ♦ H pelagicus ♦ H Peruvianum ♦ H piece ♦ H pilatus ♦ H platyrhynos ♦ H quadrangulum ♦ H rufus ♦ H Sieboldii ♦ H spelaea ♦ H sphondylium ♦ H Sylvestris ♦ H Syriacus ♦ H tergisus ♦ H thetidis ♦ H toxicarius ♦ H tubicola ♦ H venosum ♦ H versicolor ♦ H Viginica ♦ H vituli ♦ H vulgare ♦ H vulgaris ♦ H waves ♦ Hemoglobin H ♦ Kenalog H ♦ language H ♦ Margesic H ♦ North Richland H ♦ Preparation H ♦ Prostaglandins H ♦ Shelter Island H ♦ vitamin H. Additional references.
Hyphenated Usage
Beginning with "H": H-2, H-2 Antigens, h-a, h-as, h-atom, h-band, h-blast, h-block, H-blocks, H-bomb, h-bombers, h-bombs, h-bone, h-boys, H-CHO, h-dropping, H-e-m, h-er, h-file, h-five, h-grade, h-grades, H-h-a, h-had, h-hands, h-harder, h-have, h-head, h-heavy, h-heels, h-hello, h-h-hair, h-h-happier, h-h-hesitation, h-h-h-had, H-h-how, H-h-like, h-home, h-hope, H-hour, h-how, h-i, h-infinity, h-instability, h-iron, h-jetty, h-lolaire, h-methyl, H-navigationssystem, h-numbers, H-o, H-oighe, h-omeprazole, h-o-w, h-parameter, h-parameters, h-pawn, H-plane, H-Reflex, h-reg, h-registration, h-series, h-shape, h-shaped, h-street, h-test, h-thymidine, h-uridine, h-u-r-r-y, H-u-s-e-i-n, H-u-s-s-e-i-n, H-Y, H-Y Antigen, h-yrdn.
Ending with "H": ah-h-h, Ana-h, anti-h, o-h.
Containing "H": c-h-i-l-d, o-h-m, P-i-t-c-h-l.
Source: compiled by the editor from various references; see credits.
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Frequency of Internet Keywords: H
The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.
 
ExpressionFrequency
per Day		ExpressionFrequency
per Day
h
11,383
h card
197
h r block
2,727
h r springs
194
h m
2,718
local h
193
h card programming
2,101
p h
168
b h photo
1,597
b h photo video
168
b h
1,546
s m h
161
triple h
871
h h
138
h pylori
584
h vitamine
134
4 h
512
hilton h honor
133
h town
492
game h
132
buckley f h
450
h l msn
125
h k
408
4 h club
122
h m.com
395
h h music
119
clothing h m
374
c h
114
b h camera
299
h m store
113
b and h
298
h and m clothing store
113
r h
286
h r giger
113
h landing m
254
h stern
109
preparation h
233
gregg h h
107
u of h
199
h bomb
106
Source: compiled by the editor from various references; see credits.
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Modern Translation: H
Language Translations for "H"; alternative meanings/domain in parentheses.
Danish
  
H-faktor (factor H), vitamin H (biotin, vitamin H), krydspejling (Gee H), krybebrudstyrken for 100.000 h falder hurtigt ved temperaturer over 500 grader C (the 100.000 h rupture-strength decreases rapidly at temperatures above 500 C), Gee H (Gee H), for trods omdannelsestraegheden at opnaa en ferritisk-perlitisk struktur,afkoeles staalet paa forudbestemt maade:luftafkoeling til 670 grader C,2 timers holdetid og derefter luftafkoeling (held at 670 C for 2 h and then air cooled, in order to obtain a ferrite-pearlite structure, in spite of the slow transformation rate, the steel must be cooled), biotin (biotin, vitamin H). (various references)
   
Dutch
  
vitamine H (biotin, vitamin H), om,ondanks de lage omzettingssnelheid,toch een ferriet-perliet-structuur te verkrijgen,moet het staal op een speciale wijze worden gekoeld,zoals b.v.koelen tot 670 deg.C,twee uur op deze temperatuur houden en daarna in lucht afkoelen (held at 670 C for 2 h and then air cooled, in order to obtain a ferrite-pearlite structure, in spite of the slow transformation rate, the steel must be cooled), Gee-H-radarnavigatiesysteem (Gee H), factor H (factor H), de tijd-tot-breuk sterkte voor 100.000 h neemt bij temperaturen boven 500 C snel af (the 100.000 h rupture-strength decreases rapidly at temperatures above 500 C), biotine (biotin, vitamin H). (various references)
   
Farsi 
  
هشتمین حرف الفبای انگلیسی . (various references)
   
Finnish
  
hybridiparametrit (h-parameters, hybrid parameters), H.320 (H dot three twenty, H.320), H-antigeeni (H antigen), H-tason kulma (H corner, H-plane corner), H-tason T-liitos (H-plane T junction, shunt T), H-vitamiini (biotin, vitamin H), biotiini (biotin, vitamin H), alempi kriittinen kenttä (H c1, lower critical field), kriittinen kenttä (critical field, H c), ylempi kriittinen kenttä (H c2, upper critical field), kuuleman mukaan (according to h), magneettikenttämuunnos (H transform, magnetic transform), pysty-ja vaakakoordinaatit (V H coordinates), rinnakkais-T (H-plane T junction, shunt T), takaneljännes (H 1/4, hind quarter), TE-aaltomuoto (H mode, TE mode, transverse electric mode), tulla kotiin (come h), jäädä kotiin (stay at h). (various references)
   
French
  
heure, h. (various references)
   
German
  
h (b). (various references)
   
Greek 
  
H.320 (H dot three twenty, H.320), h-παράμετροι (h-parameters, hybrid parameters), παράγοντας Η (factor H), οπίσθιο τεταρτημόριο (H 1/4, hind quarter), οροί H (H-sera), αντιγόνο H (H antigen), ανώτερο κρίσιμο πεδίο (H c2, upper critical field), εγκάρσιος ηλεκτρικός ρυθμός ή H-ρυθμός (H mode, TE mode, transverse electric mode), η αντοχή στην θραύση για μια καθορισμένη διάρκεια 100.000 ωρών μειώνεται απότομα σε θερμοκρασίες άνω των 500° C (the 100.000 h rupture-strength decreases rapidly at temperatures above 500 C), Gee H (Gee H), υβριδικοί παράμετροι (h-parameters, hybrid parameters), V H συντεταγμένες (V H coordinates), μαγνητικός μετασχηματισμός (H transform, magnetic transform), βιοτίνη (biotin, vitamin H), βιταμίνη H (biotin, vitamin H), για τον σχηματισμό μιας φερριτικής-περλιτικής δομής παρά τον χαμηλό βαθμό μετασχηματισμού,προκαλούμε ψύξη του χάλυβα μέχρι τους 670° C,διατ (held at 670 C for 2 h and then air cooled, in order to obtain a ferrite-pearlite structure, in spite of the slow transformation rate, the steel must be cooled), συντεταγμένες V H (V H coordinates), σύνδεση Τ στο Η-επίπεδο (H-plane T junction, shunt T), κατώτερο κρίσιμο πεδίο (H c1, lower critical field), κυματοδηγός με κάμψη στο Η-επίπεδο (H corner, H-plane corner), κρίσιμο πεδίο (critical field, H c), υδρογονοβόμβα (h bomb, hydrogen bomb). (various references)
   
Hebrew 
  
שעת ה'ש' (h hour), שעת האפס (h hour, zero hour), פצצת מימן (h bomb, hydrogen bomb). (various references)
   
Hungarian
  
hidrogénbomba (fusion bomb, h bomb, hydrogen bomb), h-óra (h hour). (various references)
   
Italian
  
h (hour, Hydrogen), ora (at present, hour, in a minute, moment, now, period, shortly, time). (various references)
   
Japanese Kanji 
  
行動発起時刻  (h-hour). (various references)
   
Japanese Katakana 
  
こうどうはっきじこく (h-hour). (various references)
   
Manx
  
H-gharmin (H-beam). (various references)
   
Pig Latin
  
hay.(various references)
   
Portuguese
  
H-bomba (H-bomb), H.320 (H dot three twenty, H.320), transferência magnética (H transform, magnetic transform), biotina (biotin, vitamin H), campo crítico (critical field, H c), campo crítico inferior (H c1, lower critical field), campo crítico superior (H c2, upper critical field), coordenadas V H (V H coordinates), cotovelo brusco H (H corner, H-plane corner), cotovelo brusco plano H (H corner, H-plane corner), factor H (factor H), junção em T plano H (H-plane T junction, shunt T), antigénio H (H antigen), T paralelo (H-plane T junction, shunt T), vitamina H (biotin, vitamin H), modo eléctrico (H mode, TE mode, transverse electric mode), modo eléctrico transversal (H mode, TE mode, transverse electric mode), modo H (H mode, TE mode, transverse electric mode), modo TE (H mode, TE mode, transverse electric mode), navegação Gee H (Gee H), parametros hibridos (h-parameters, hybrid parameters), plasma método H (H-mode plasma), soro H (H-sera). (various references)
   
Romanian
  
orã h (h hour), bombã cu hidrogen (fusion bomb, h bomb, thermonuclear hydrogen bomb). (various references)
   
Russian 
  
взрыв водородной бомбы (h-blast). (various references)
   
Serbo-Croatian
  
hidrogenska bomba (h bomb, hydrogen bomb), happy hour (h hour), vreme početka ofanzive (h hour), eksplozija hidrogenske bombe (h-blast). (various references)
   
Spanish
  
horas (hours), hora (hour, o'clock, term, time, tour), h (Hotel, International Code of Signals, single letter signal "I have a pilot on board"). (various references)
   
Swedish
  
h-järn (h-iron). (various references)
   
Thai
  
พยัญชนะอังกฤษตัวที่ 8. (various references)
   
Turkish
  
hidrojen (hydrogen). (various references)
   
Ukrainian
  
воднева бомба (h bomb). (various references)
   
Vietnamese 
  
giờ nổ súng (h-hour), bom khinh khí (h-bomb, hydrogen bomb, superbomb), bom hyddro (h-bomb). (various references)
Source: compiled by the editor from various translation references.
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Bible Trace: H
LanguageDateSourceMatthew Chapter 22, Verse 35
Greek (transliterated)250 BCSeptuagintKai ephrwthsen eiV ex autwn nomikoV peirazwn auton kai legwn

Latin405VulgateEt interrogavit eum unus ex eis legis doctor temptans eum

Old English990West Saxon& an þe wæs þare lage lareow axodehine. & fandede hine þus cweðende.
Middle English1395WyclifAnd oon of hem, a techere of the lawe, axide Jhesu, and temptide him,
Renaissance English1526TyndaleAnd one of them which was a doctoure of lawe axed a question teptinge h m and sayinge:
Jacobean English1611King JamesThen one of them, which was a lawyer, asked him a question, tempting him, and saying,
Victorian English1833WebsterThen one of them who was a lawyer, asked him a question, tempting him, and saying,

Basic English1964OgdenAnd one of them, a teacher of the law, put a question to him, testing him, and saying,

Source: compiled by the editor from various references; see credits.
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Matched Bible Translations: H
LanguageMatthew Chapter 22, Verse 35
CebuanoUg usa kanila, nga batid sa kasugoan, may gipangutana kaniya aron sa pagsulay kaniya.
Croatiana jedan od njih, zakonoznanac, da ga iskuša, upita:
DanishOg en af dem, en lovkyndig, spurgte og fristede ham og sagde:
DutchEn een uit hen, zijnde een wetgeleerde, heeft gevraagd, Hem verzoekende, en zeggende:
Finnishja eräs heistä, joka oli lainoppinut, kysyi häneltä kiusaten:
Frenchet l`un d`eux, docteur de la loi, lui fit cette question, pour l`éprouver:
GermanUnd einer unter ihnen, ein Schriftgelehrter, versuchte ihn und sprach:
Haitian CreoleYonn ladan yo ki te dirèktè lalwa mande li:
Indonesian-Bahasa Sehari-hariSeorang dari mereka, yaitu seorang guru agama, mencoba menjebak Yesus dengan suatu pertanyaan.
Indonesian-Terjemahan LamaMaka seorang dari antara mereka itu, seorang fakih, menyoal Yesus hendak mencobai Dia, katanya,
Manx GaelicAs denee fer jeu ard-ynsit 'sy leigh, question jeh, dy phrowal eh, gra,
MaoriNa ka ui tetahi o ratou, he kaiako i te ture, ka whakamatautau i a ia, ka mea,
Norwegianog en av dem, en lovkyndig, spurte for å friste ham:
Portuguesee um deles, doutor da lei, para o experimentar, interrogou- o, dizendo:   
RumanianWi unul din ei, un knvqyqtor al Legii, ca sq -L ispiteascq, I -a pus kntrebarea urmqtoare:
ShuarTura chikichik Pariséu jintintin asa Jesusan uyumtikiataj tusa aniasmiayi
SwahiliMmoja wao, mwanasheria, akamwuliza Yesu kwa kumjaribu,
Swedishoch en av dem, som var lagklok, ville snärja honom och frågade:
UmaHadua ngkai laintongo' -ra, hadua guru agama, mperao mpo'opa petompoi' Yesus hante pompekunea' -na, na'uli':
Source: compiled by the editor from various references; see credits.
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Anagrams: H
Scrabble® Enable2K-Verified Anagrams
 Words containing the letters "h"
 
+1 letter: ah, eh, ha, he, hi, hm, ho, oh, sh, uh.
 
+2 letters: aah, aha, ash, bah, chi, dah, duh, edh, eth, feh, foh, ghi, had, hae, hag, hah, haj, ham, hao, hap, has, hat, haw, hay, heh, hem, hen, hep, her, hes, het, hew, hex, hey, hic, hid, hie, him, hin, hip, his, hit, hmm, hob, hod, hoe, hog, hon, hop, hot, how, hoy, hub, hue, hug, huh, hum, hun, hup, hut, hyp, ich, khi, mho, nah, noh, nth, ohm, oho, ohs, ooh, pah, peh, phi, pht, poh, rah, rho, sha, she, shh, shy, the, tho, thy, ugh, wha, who, why, yah, yeh.
Source: compiled by the editor from various references; see credits.

SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.
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INDEX
 1. Definition 
 2. Synonyms 
 3. Crosswords 
 4. Usage: Modern 		 5. Usage: Commercial 
 6. Images: Slideshow 
 7. Images: Photo Album 
 8. Images: Digital Art 		 9. Quotations: Non-fiction 
 10. Usage Frequency 
 11. Names: Company Usage 
 12. Expressions 		 13. Expressions: Internet 
 14. Translations: Modern 
 15. Bible Trace 
 16. Abbreviations 		 17. Acronyms 
 18. Anagrams 
 19. Bibliography 


  
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