PRESSURE CHAMBER

Domain	Definition
Mining	A. An enclosed space arranged on the access side of a stopping, which seals off an area and is furnished with means of raising or lowering the air pressure within it b. If the mine area to be sealed off is extensive, and the seals are widely scattered, the fact that they are subject to different pressures may be unavoidable. In this event, pressure chambers may be required on the outby side of seals. Pressure chambers are also of value when the seals cannot be made tight, because of broken or fissured ground. The principle consists of building an outer chamber by erecting a second stopping on the outby side of the seal. The air pressure in the intervening space is then controlled to prevent movement of air across the seal c. A method of driving tunnels and sinking shafts through running sand by holding back the loose material by compressed air. The technique is no longer applied to any great extent in mining. See also:caisson sinki. (references)
Source: compiled by the editor from various references; see credits.

Frequency of Internet Keywords: PRESSURE CHAMBER

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.

Anagrams: PRESSURE CHAMBER

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-b-c-e-e-e-h-m-p-r-r-r-s-s-u"
	-4 letters: premeasures, repurchases, researchers.
	-5 letters: charmeuses, cupbearers, embrasures, precreases, premeasure, purchasers, reemphases, rehearsers, remeasures, repurchase, researcher, researches, superraces.
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.