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barometric pressure

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atmospheric pressure

 or barometric pressure

Force 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.

barometric pressure [bar·ə′met·rik ′presh·ər]
atmospheric pressure, barometric pressure
The pressure exerted by the earth’s atmosphere; under standard conditions equal to 14.7 lb per sq in. (1.01 × 106 pascals) equivalent to the pressure exerted by a column of mercury 29.9 in. (76.0 cm) high.
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Winds are created by differences in barometric pressure.
Out of air by Earth Island Journal
Low barometric pressure generally means cloudy skies and storms, while high pressure means clear skies.
Weather changes may cause headaches by Balochistan Times (Baluchistan Province, Pakistan)
Lower barometric pressure within two or three days of the hospital visit increased the risk.
Weather or not; In association with the NHS by Evening Chronicle (Newcastle, England)
 
 
 
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