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- 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; abbreviated atmAbbreviation for atmosphere, a unit of pressure equal to 101.325 kPa or 760 mmHg.. Also, the mixtureA combination of two or more substances in which the substances retain their chemical identity. of gases surrounding the earth.