How many inch of water [4 °C] in 1 inch Hg? The answer is 13.595100196653. We assume you are converting between inch of water [4 °C] and inch of mercury [0 °C]. You can view more details on each measurement unit: inch of water [4 °C] or inch Hg The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0040146307866177 inch of water [4 °C], or 0.00029529983071445 inch 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 of mercury. Type in your own numbers in the form to convert the units!
1 inch of water [4 °C] to inch Hg = 0.07356 inch Hg
10 inch of water [4 °C] to inch Hg = 0.73556 inch Hg
20 inch of water [4 °C] to inch Hg = 1.47112 inch Hg
30 inch of water [4 °C] to inch Hg = 2.20668 inch Hg
40 inch of water [4 °C] to inch Hg = 2.94224 inch Hg
50 inch of water [4 °C] to inch Hg = 3.6778 inch Hg
100 inch of water [4 °C] to inch Hg = 7.35559 inch Hg
200 inch of water [4 °C] to inch Hg = 14.71118 inch Hg
You can do the reverse unit conversion from inch Hg to inch of water [4 °C], 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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