Pound per square inch, Pressure

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" Read more >>

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Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface. Read more >>