How many millimeter mercury in 1 ft H2O? The answer is 22.419842293221. We assume you are converting between millimeter mercury [0 °C] and foot water [4 °C]. You can view more details on each measurement unit: millimeter mercury or ft H2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006157584566 millimeter mercury, or 0.00033455256555148 ft H2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters mercury and feet water. Type in your own numbers in the form to convert the units!
1 millimeter mercury to ft H2O = 0.0446 ft H2O
10 millimeter mercury to ft H2O = 0.44603 ft H2O
20 millimeter mercury to ft H2O = 0.89207 ft H2O
30 millimeter mercury to ft H2O = 1.3381 ft H2O
40 millimeter mercury to ft H2O = 1.78413 ft H2O
50 millimeter mercury to ft H2O = 2.23017 ft H2O
100 millimeter mercury to ft H2O = 4.46033 ft H2O
200 millimeter mercury to ft H2O = 8.92067 ft H2O
You can do the reverse unit conversion from ft H2O to millimeter mercury, or enter any two units below:
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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