What does PSI stand for?


Quick Answer

PSI stands for pounds per square inch, a unit used to measure pressure. One PSI is equal to the amount of force exerted by a pound of matter in Earth's gravity on an area 1 square inch in size.

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Full Answer

PSI is commonly used to measure the pressure of gases, such as tire pressure in cars as well as fluid pressure in many industrial settings. As it is a nonmetric unit, its use is less common outside the United States and the U.K. In other countries, the SI unit Pascal is used instead, and 1 PSI is equal to 6,894.76 Pascal.

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