Pound per square inch
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The pound per square inch or, more accurately, pound-force per square inch, is a unit of measurement of pressure or of stress based on avoirdupois units and used primarily in the United States. It is
A pressure gauge reading in psi (red scale) and kPa (black scale)
Standard atmosphere (unit)
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The standard atmosphere is a unit of pressure defined as 101325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's average atmospheric pressure
Aneroid barometer for household use from c. 1925
