Units of measurement
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Pounds per square inch (psi)
Pounds per square foot (psf)
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Pounds per square inch (psi)
Pound per square inch (psi) — a unit of pressure based on pounds of force applied per square inch. Primarily used in the USA and UK.
Pounds per square foot (psf)
Pound per square foot (psf) — a unit of pressure based on pounds of force applied to a square foot. Used in construction and for measuring pressure in heating and ventilation systems.