atmosphere (unit)

When expressed as a measurement, an atmosphere or standard atmosphere is a unit of pressure roughly equal to the average atmospheric pressure at sea level on the earth. It is defined as the pressure under 760 mm of mercury.

1 atm: = 101325 Pa = 101325 kg/m s = 101325 N/m; = 1013.25 hPa = 1013.25 mbar; = 101.325 kPa; = 1.01325 bar; = 760 torr = 760 millimeter of mercury (mmHg); = ca. 29.921 259 842 519 685 039 363 inches of mercury; = ca. 14.695949 pounds per square inch (PSI)

In Britain, scuba divers and others often use the word atmosphere loosely to mean 1 bar (1000 millibars or 100000 Pa). The unit technical atmosphere (at) is defined as the pressure under 10 meters of water, 1 at = 98066.5 Pa.

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