Pounds per square inch (psi, PSI, lb/in2, lb/sq in)
Pounds per square inch (psi, PSI, lb/in2, lb/sq in) :
Commonly used in the U.S., but not elsewhere. Normal atmospheric pressure is 14.7 psi, which means that a column of air one square inch in area rising from the Earth's atmosphere to space weighs 14.7 pounds
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