How many inch of water in 1 in Hg? The answer is 13.595101534864. We assume you are converting between inch of water [4 °C] and inch mercury [0 °C]. You can view more details on each measurement unit: inch of water or in Hg The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0040146307866177 inch of water, 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 inches of water and inches mercury. Type in your own numbers in the form to convert the units!
1 inch of water to in Hg = 0.07356 in Hg
10 inch of water to in Hg = 0.73556 in Hg
20 inch of water to in Hg = 1.47112 in Hg
30 inch of water to in Hg = 2.20668 in Hg
40 inch of water to in Hg = 2.94224 in Hg
50 inch of water to in Hg = 3.6778 in Hg
100 inch of water to in Hg = 7.35559 in Hg
200 inch of water to in Hg = 14.71118 in Hg
You can do the reverse unit conversion from in Hg to inch of water, 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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