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How many inch of mercury in 1 water column [millimeter]?
The answer is 0.0028959020848759.

We assume you are converting between **inch of mercury [0 °C]** and **water column [millimeter]**.

You can view more details on each measurement unit:

inch of mercury or
water column [millimeter]

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.10197162129779 water column [millimeter].

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between inches of mercury and water column.

Type in your own numbers in the form to convert the units!

1 inch of mercury to water column [millimeter] = 345.31554 water column [millimeter]

2 inch of mercury to water column [millimeter] = 690.63109 water column [millimeter]

3 inch of mercury to water column [millimeter] = 1035.94663 water column [millimeter]

4 inch of mercury to water column [millimeter] = 1381.26217 water column [millimeter]

5 inch of mercury to water column [millimeter] = 1726.57771 water column [millimeter]

6 inch of mercury to water column [millimeter] = 2071.89326 water column [millimeter]

7 inch of mercury to water column [millimeter] = 2417.2088 water column [millimeter]

8 inch of mercury to water column [millimeter] = 2762.52434 water column [millimeter]

9 inch of mercury to water column [millimeter] = 3107.83988 water column [millimeter]

10 inch of mercury to water column [millimeter] = 3453.15543 water column [millimeter]

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

inch of mercury to foot of mercury

inch of mercury to inch water

inch of mercury to gigapascal

inch of mercury to torr

inch of mercury to bar

inch of mercury to attobar

inch of mercury to meter of head

inch of mercury to foot of water

inch of mercury to picobar

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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