How many inch of water in 1 millimeter mercury?
The answer is 0.53524016106163.

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

You can view more details on each measurement unit:

inch of water or
millimeter mercury

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

1 pascal is equal to 0.0040146307866177 inch of water, or 0.0075006157584566 millimeter mercury.

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

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

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

1 inch of water to millimeter mercury = 1.86832 millimeter mercury

5 inch of water to millimeter mercury = 9.3416 millimeter mercury

10 inch of water to millimeter mercury = 18.6832 millimeter mercury

15 inch of water to millimeter mercury = 28.0248 millimeter mercury

20 inch of water to millimeter mercury = 37.3664 millimeter mercury

25 inch of water to millimeter mercury = 46.708 millimeter mercury

30 inch of water to millimeter mercury = 56.04961 millimeter mercury

40 inch of water to millimeter mercury = 74.73281 millimeter mercury

50 inch of water to millimeter mercury = 93.41601 millimeter mercury

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

inch of water to inch water

inch of water to sthene/square meter

inch of water to foot mercury

inch of water to terabar

inch of water to dekapascal

inch of water to centimeter mercury

inch of water to decitorr

inch of water to kilopond/square meter

inch of water to yoctopascal

inch of water to kilobar

The millimeter of mercury by definition is 133.322387415 Pa (13.5951 g/cm3 × 9.80665 m/s2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity.

The torr is defined as 1/760 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to

101325/760 Pa. The decimal form of this fraction is approximately 133.322368421.

The relationship between the torr and the millimeter of mercury is:

1 Torr = 0.999999857533699 mmHg

1 mmHg = 1.000000142466321 Torr

The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%). This small difference is negligible for most applications outside metrology.

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