Inch of mercury
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Inch of mercury is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States.
Early American barometer calibrated in inches of mercury
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)