How many millimeter water [4 °C] in 1 inch mercury? The answer is 345.31557667501. We assume you are converting between millimeter water [4 °C] and inch mercury [0 °C]. You can view more details on each measurement unit: millimeter water [4 °C] or inch mercury The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.10197162129779 millimeter water [4 °C], or 0.00029529980164712 inch mercury. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters water and inches mercury. Type in your own numbers in the form to convert the units!
1 millimeter water [4 °C] to inch mercury = 0.0029 inch mercury
10 millimeter water [4 °C] to inch mercury = 0.02896 inch mercury
50 millimeter water [4 °C] to inch mercury = 0.1448 inch mercury
100 millimeter water [4 °C] to inch mercury = 0.28959 inch mercury
200 millimeter water [4 °C] to inch mercury = 0.57918 inch mercury
500 millimeter water [4 °C] to inch mercury = 1.44795 inch mercury
1000 millimeter water [4 °C] to inch mercury = 2.8959 inch mercury
You can do the reverse unit conversion from inch mercury to millimeter 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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