Standard atmospheric pressure

standard atmospheric pressure

That pressure (force per unit area) recorded when the height of a column of mercury is reduced to standard gravity and temperature.

It is the pressure exerted by a column of mercury 760 mm high, of density 13 595.1 kg m⁻³, subject to a gravitational acceleration of 9.80665 m s⁻², and equals 1013.25 hPa. This is a sea level consideration at 45°N latitude.

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(Also called barometric pressure.) The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.