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atmospheric pressure |
Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia, Hutchinson | 0.13 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. 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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The John Deere Complete Wireless Weather Station comes equipped with outdoor sensors that operate on solar power and forecast for the next 12 to 24 hours based on barometric pressure. This means forecasts for barometric pressure, wind speed and direction, wave heights and more can be overlaid right on top of your charts. If one trains at sea level where the relative oxygen content of the ambient air is 21%, and the barometric pressure is 760 mmHg (mercury), and the atmospheric oxygen pressure is 160mm Hg, the alveolar oxygen pressure averages about 110 mmHg, and the arterial blood oxygen pressure rises to 96 mmHg. |
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