What Is PSI? - Definition of Unit

What Does PSI Stand For?

PSI is a common unit of pressure.
PSI is a common unit of pressure. Ryan Etter / Getty Images
by Anne Marie Helmenstine, Ph.D.
Updated July 24, 2017

PSI Definition: PSI is a unit of pressure expressed in pounds of force per square inch of area. It stands for Pounds per Square Inch.

1 PSI = 6894 Pascals = 0.070 atmospheres = 51.715 torr

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Helmenstine, Anne Marie, Ph.D. "What Is PSI? - Definition of Unit." ThoughtCo, Jul. 24, 2017, thoughtco.com/what-does-psi-stand-for-605565. Helmenstine, Anne Marie, Ph.D. (2017, July 24). What Is PSI? - Definition of Unit. Retrieved from https://www.thoughtco.com/what-does-psi-stand-for-605565 Helmenstine, Anne Marie, Ph.D. "What Is PSI? - Definition of Unit." ThoughtCo. https://www.thoughtco.com/what-does-psi-stand-for-605565 (accessed April 23, 2018).