The Pascal and Common Pressure Units
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Pressure is measured in several units — the pascal, atmosphere, torr, millimeters of mercury, bar, and psi — related to each other by fixed conversion factors.
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One atmosphere equals 101,325 pascals, 760 torr, and about 14.7 pounds per square inch.
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These units measure the identical physical quantity; switching between them changes the number, never the pressure itself.