How many inch mercury in 1 in H2O? The answer is 0.073555905223332. We assume you are converting between inch mercury [0 °C] and inch water [4 °C]. You can view more details on each measurement unit: inch mercury or in H2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00029529980164712 inch mercury, or 0.0040146307866177 in H2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches mercury and inches water. Type in your own numbers in the form to convert the units!
1 inch mercury to in H2O = 13.5951 in H2O
2 inch mercury to in H2O = 27.1902 in H2O
3 inch mercury to in H2O = 40.7853 in H2O
4 inch mercury to in H2O = 54.38041 in H2O
5 inch mercury to in H2O = 67.97551 in H2O
6 inch mercury to in H2O = 81.57061 in H2O
7 inch mercury to in H2O = 95.16571 in H2O
8 inch mercury to in H2O = 108.76081 in H2O
9 inch mercury to in H2O = 122.35591 in H2O
10 inch mercury to in H2O = 135.95102 in H2O
You can do the reverse unit conversion from in H2O to inch mercury, or enter any two units below:
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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