Originally Posted by TheOtherDave™
Pounds per square inch.
It is a measurement of pressure that applies to pneumatics (air) or hydraulics (fluid).
Most commonly, it is used to quantify the amount of boost a supercharger or turbocharger is producing at the intake manifold of an internal combustion engine.
It's also used as a measurement of stress in a material. And I think it's more commonly used to quantify the amount of air inside a tire.
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