How many inch mercury [0 °C] in 1 millimeters water? The answer is 0.0028959017998228. We assume you are converting between inch mercury [0 °C] and millimeter water [4 °C]. You can view more details on each measurement unit: inch mercury [0 °C] or millimeters water The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00029529980164712 inch mercury [0 °C], or 0.10197162129779 millimeters water. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches mercury and millimeters water. Type in your own numbers in the form to convert the units!
1 inch mercury [0 °C] to millimeters water = 345.31558 millimeters water
2 inch mercury [0 °C] to millimeters water = 690.63115 millimeters water
3 inch mercury [0 °C] to millimeters water = 1035.94673 millimeters water
4 inch mercury [0 °C] to millimeters water = 1381.26231 millimeters water
5 inch mercury [0 °C] to millimeters water = 1726.57788 millimeters water
6 inch mercury [0 °C] to millimeters water = 2071.89346 millimeters water
7 inch mercury [0 °C] to millimeters water = 2417.20904 millimeters water
8 inch mercury [0 °C] to millimeters water = 2762.52461 millimeters water
9 inch mercury [0 °C] to millimeters water = 3107.84019 millimeters water
10 inch mercury [0 °C] to millimeters water = 3453.15577 millimeters water
You can do the reverse unit conversion from millimeters water to inch mercury [0 °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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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