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pound/square inch [gauge]
pound/square inch [absolute]
How many inch of mercury in 1 pounds per square inch?
The answer is 2.0360206576.
We assume you are converting between inch of mercury [0 °C] and pound/square inch [absolute].
You can view more details on each measurement unit:
inch of mercury or pounds per square inch
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.000295299830714 inch of mercury, or 0.000145037738007 pounds per square inch.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of mercury and pounds/square inch.
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Inches of mercury or inHg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.
It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.
1 inHg = 3,386.389 pascals at 0 °C.
Aircraft operating at higher altitudes (above 18,000 feet) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.
Piston engine aircraft with constant-speed propellers also use inHg to measure manifold pressure, which is indicative of engine power produced.
Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level.
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