›› Convert inch of mercury [0 C] to atmosphere [technical]

inch of mercury
atmosphere [technical]

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atmosphere [technical]

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How many inch of mercury in 1 atmosphere [technical]? The answer is 28.959020848759.
We assume you are converting between inch of mercury [0 C] and atmosphere [technical].
You can view more details on each measurement unit:
inch of mercury or atmosphere [technical]
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inch of mercury, or 1.0197162129779E-5 atmosphere [technical].
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of mercury and atmospheres.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of inch of mercury to atmosphere [technical]

1 inch of mercury to atmosphere [technical] = 0.03453 atmosphere [technical]

10 inch of mercury to atmosphere [technical] = 0.34532 atmosphere [technical]

20 inch of mercury to atmosphere [technical] = 0.69063 atmosphere [technical]

30 inch of mercury to atmosphere [technical] = 1.03595 atmosphere [technical]

40 inch of mercury to atmosphere [technical] = 1.38126 atmosphere [technical]

50 inch of mercury to atmosphere [technical] = 1.72658 atmosphere [technical]

100 inch of mercury to atmosphere [technical] = 3.45316 atmosphere [technical]

200 inch of mercury to atmosphere [technical] = 6.90631 atmosphere [technical]

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You can do the reverse unit conversion from atmosphere [technical] to inch of mercury, or enter any two units below:

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›› Common pressure conversions

inch of mercury to barad
inch of mercury to water column
inch of mercury to centitorr
inch of mercury to millimeter of water
inch of mercury to millipascal
inch of mercury to centihg
inch of mercury to dyne/square centimeter
inch of mercury to petabar
inch of mercury to millitorr
inch of mercury to terapascal

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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