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Atmospheric Pressure

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atmospheric pressure
air pressure, pressure of the layer of air surrounding the earth

Wikipedia English The Free Encyclopedia

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Atmospheric pressure
Atmospheric pressure, sometimes also called barometric pressure, is the pressure exerted by the weight of air in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. On a given plane, low-pressure areas have less atmospheric mass above their location, whereas high-pressure areas have more atmospheric mass above their location. Likewise, as elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. On average, a column of air one square centimeter in cross-section, measured from sea level to the top of the atmosphere, has a mass of about 1.03 kg and weight of about 10.1 N (2.28 lbf). (A column one square inch in cross-section would have a weight of about 14.7 lbs, or about 65.4 N.).

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WordNet 2.0 Dictionary

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atmospheric pressure

Noun
1. the pressure exerted by the atmosphere
(synonym) air pressure
(hypernym) gas pressure
(hyponym) barometric pressure


Dictionary of Medicine

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atmospheric pressure
noun
normal pressure of the air
COMMENT: disorders due to variations in atmospheric pressure include mountain sickness and caisson diseases


Integrated Circuit Dictionary

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Atmospheric Pressure
the pressure exerted by the weight of air. The standard atmospheric pressure on earth is 14.7 pounds per square inch (PSI) or 1 kilogram (Kg) per square centimeter (cm2). Actual pressure at any point and time on the face of the earth depends on altitude and atmospheric conditions.

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