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- (chemistry) The downward pressure, at any given point in the atmosphere, of the gases directly above that point. Average pressure globally at sea level is 1,013,000 dynes per centimeter squared or 760 torr. This is defined as one atmosphere.
[A Field Guide to the Atmosphere; Day, John and Schaefer, Vincent; 347; 1981; Houghton Mifflin; Boston.] [Ice Time; Levenson, Thomas; 69-70; 1989; Harper and Row; NY.]
Source: Atmospheric Chemistry Glossary
- (geology) The barometric pressure of the air at any point is that exerted by the weight of the atmosphere above that point. It therefore varies with the elevation of the point above or the depth below sea level. Barometric pressure is measured by the mercury barometer, and is of the order of 30 in (762 mm) of mercury at sea level. Spalding
Source: Dictionary of Mining, Mineral, and Related Terms
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