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Barometric pressure

The absolute pressure of the ambient atmosphere, varying with weather, altitude, etc.; expressed in millibars (meteorology) or mm hg or torr (respiratory physiology); at sea level, one atmosphere (atm, 760 mm hg or torr) is equivalent to: 14.69595 lb/sq in, 1013.25 millibars, 1013.25 × 106 dynes/cm2, and, in si units, 101,325 pascals (Pa).

Synonym: atmospheric pressure.