Abbreviation for atmosphereA unit of pressure equal to 101.325 kPa or 760 mmHg; abbreviated atm. Also, the mixture of gases surrounding the earth., a unitA particular measure of a physical quantity that is used to express the magnitude of the physical quantity; for example, the meter is the unit of the physical quantity, length. of pressureForce per unit area; in gases arising from the force exerted by collisions of gas molecules with the wall of the container. equal to 101.325 kPa or 760 mmHg.
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