How many millimeter mercury in 1 cmH2O? The answer is 0.73555913527668. We assume you are converting between millimeter mercury [0 °C] and centimeter of water [4 °C]. You can view more details on each measurement unit: millimeter mercury or cmH2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006157584566 millimeter mercury, or 0.010197162129779 cmH2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters mercury and centimeters of water. Type in your own numbers in the form to convert the units!
1 millimeter mercury to cmH2O = 1.35951 cmH2O
5 millimeter mercury to cmH2O = 6.79755 cmH2O
10 millimeter mercury to cmH2O = 13.5951 cmH2O
15 millimeter mercury to cmH2O = 20.39265 cmH2O
20 millimeter mercury to cmH2O = 27.1902 cmH2O
25 millimeter mercury to cmH2O = 33.98775 cmH2O
30 millimeter mercury to cmH2O = 40.7853 cmH2O
40 millimeter mercury to cmH2O = 54.3804 cmH2O
50 millimeter mercury to cmH2O = 67.9755 cmH2O
You can do the reverse unit conversion from cmH2O 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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