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atmospheric pressure |
Also found in: Medical, Acronyms, Wikipedia, Hutchinson | 0.02 sec. |
atmospheric pressureor barometric pressureForce per unit area exerted by the air above the surface of the Earth. Standard sea-level pressure, by definition, equals 1 atmosphere (atm), or 29.92 in. (760 mm) of mercury, 14.70 lbs per square in., or 101.35 kilopascals, but pressure varies with elevation and temperature. It is usually measured with a mercury barometer (hence the term barometric pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere above it. It may also be measured using an aneroid barometer, in which the action of atmospheric pressure in bending a metallic surface is made to move a pointer. atmospheric pressure [¦at·mə¦sfir·ik ′presh·ər] (physics) The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned. Also known as barometric pressure. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Experimenters controlled the chamber's air pressure so that it was nearly 1 atmosphere, or sea level pressure, for some experiments and, for others, just 0. For instance, at sea level pressure on Earth, water exists as a liquid at temperatures between 0#161#C and 100#161#C. Hyperbaric oxygen therapy -- the administration of 100 percent oxygen at greater than sea level pressure -- has had its ups and downs. |
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