How many millihg in 1 inHg? The answer is 25.399999704976. We assume you are converting between millihg and inch of mercury [0 °C]. You can view more details on each measurement unit: millihg or inHg The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006156130264 millihg, or 0.00029529983071445 inHg. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millihg and inches of mercury. Type in your own numbers in the form to convert the units!
1 millihg to inHg = 0.03937 inHg
10 millihg to inHg = 0.3937 inHg
20 millihg to inHg = 0.7874 inHg
30 millihg to inHg = 1.1811 inHg
40 millihg to inHg = 1.5748 inHg
50 millihg to inHg = 1.9685 inHg
100 millihg to inHg = 3.93701 inHg
200 millihg to inHg = 7.87402 inHg
You can do the reverse unit conversion from inHg to millihg, or enter any two units below:
The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.
So 1 millihg = 10-3 hg.
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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