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The pound-force per square inch (symbol: lbf/in2) is a non-SI unit of pressure based on avoirdupois units. In casual English language use it is rendered as "pounds per square inch", abbreviated to psi with little distinction between "mass" and "force"
Definition At 1 lbf/in2, a force of one pound-force is applied to an area of one square inch. 1 lbf/in² = 6,894.75729 pascals (Pa) Other abbreviations are used that append a modifier to "psi". However, the National Institute of Standards and Technology recommends that, to avoid confusion, any modifiers be instead applied to the quantity being measured rather than the unit of measure* For example, "Pg = 100 psi" rather than "P = 100 psig". KSI and Kip The ksi (kip, "kilo-pound per square inch") is defined as 1000 psi, combining the prefix kilo with the psi abbreviation. It is occasionally seen in materials science and mechanical engineering, where it is used to specify stress and Young's modulus. Context See also | ||||||||
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