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

We assume you are converting between **inch of mercury [0 °C]** and **millimeter of water [4 °C]**.

You can view more details on each measurement unit:

inch of mercury or
millimeter of water

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

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

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

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

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

1 inch of mercury to millimeter of water = 345.31554 millimeter of water

2 inch of mercury to millimeter of water = 690.63109 millimeter of water

3 inch of mercury to millimeter of water = 1035.94663 millimeter of water

4 inch of mercury to millimeter of water = 1381.26217 millimeter of water

5 inch of mercury to millimeter of water = 1726.57771 millimeter of water

6 inch of mercury to millimeter of water = 2071.89326 millimeter of water

7 inch of mercury to millimeter of water = 2417.2088 millimeter of water

8 inch of mercury to millimeter of water = 2762.52434 millimeter of water

9 inch of mercury to millimeter of water = 3107.83988 millimeter of water

10 inch of mercury to millimeter of water = 3453.15543 millimeter of water

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

inch of mercury to pound/square foot

inch of mercury to ton/square foot

inch of mercury to kilogram-force/square millimeter

inch of mercury to barye

inch of mercury to megapascal

inch of mercury to dyne/square centimeter

inch of mercury to kip/square foot

inch of mercury to water column

inch of mercury to kilopascal

inch of mercury to technical atmosphere

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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