## ››Convert millihg to

 millihg inch mercury

How many millihg in 1 inch mercury? The answer is 25.400002205181.
We assume you are converting between millihg and .
You can view more details on each measurement unit:
millihg or inch mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006156130264 millihg, 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 millihg and inches mercury.
Type in your own numbers in the form to convert the units!

## ››Quick conversion chart of millihg to inch mercury

1 millihg to inch mercury = 0.03937 inch mercury

10 millihg to inch mercury = 0.3937 inch mercury

20 millihg to inch mercury = 0.7874 inch mercury

30 millihg to inch mercury = 1.1811 inch mercury

40 millihg to inch mercury = 1.5748 inch mercury

50 millihg to inch mercury = 1.9685 inch mercury

100 millihg to inch mercury = 3.93701 inch mercury

200 millihg to inch mercury = 7.87402 inch mercury

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## ››Definition: Millihg

The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.

So 1 millihg = 10-3 hg.

## ››Definition: Inch mercury

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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