Units of measurement
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Pounds per square inch (psi)
Millimeters of water (mmH2O)
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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.
Millimeters of water (mmH2O)
Millimeters of water (mmH2O) — a unit of pressure equal to the pressure exerted by a 1-millimeter high column of water. Used in hydrostatics and water systems.