How many inch of mercury in 1 inch water?
The answer is 0.073555912463681.

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

You can view more details on each measurement unit:

inch of mercury or
inch water

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

1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.0040146307866177 inch 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 inches water.

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

1 inch of mercury to inch water = 13.5951 inch water

2 inch of mercury to inch water = 27.1902 inch water

3 inch of mercury to inch water = 40.7853 inch water

4 inch of mercury to inch water = 54.3804 inch water

5 inch of mercury to inch water = 67.9755 inch water

6 inch of mercury to inch water = 81.5706 inch water

7 inch of mercury to inch water = 95.1657 inch water

8 inch of mercury to inch water = 108.7608 inch water

9 inch of mercury to inch water = 122.3559 inch water

10 inch of mercury to inch water = 135.951 inch water

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

inch of mercury to zettapascal

inch of mercury to water column

inch of mercury to technical atmosphere

inch of mercury to micrometer of mercury

inch of mercury to millipascal

inch of mercury to dekapascal

inch of mercury to newton/square millimeter

inch of mercury to bar

inch of mercury to foot mercury

inch of mercury to micropascal

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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