How many psia in 1 in Hg? The answer is 0.49115420057253. We assume you are converting between pound/square inch [absolute] and inch mercury [0 °C]. You can view more details on each measurement unit: psia or in Hg The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00014503773800722 psia, or 0.00029529980164712 in Hg. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between pounds/square inch and inches mercury. Type in your own numbers in the form to convert the units!
1 psia to in Hg = 2.03602 in Hg
5 psia to in Hg = 10.1801 in Hg
10 psia to in Hg = 20.3602 in Hg
15 psia to in Hg = 30.54031 in Hg
20 psia to in Hg = 40.72041 in Hg
25 psia to in Hg = 50.90051 in Hg
30 psia to in Hg = 61.08061 in Hg
40 psia to in Hg = 81.44082 in Hg
50 psia to in Hg = 101.80102 in Hg
You can do the reverse unit conversion from in Hg to psia, or enter any two units below:
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.
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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.
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