Plural form: millimeters mercury
Symbol: mm Hg
Alternate spelling: mm mercury
Category type: pressure
Scale factor: 133.322387415
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006157584566 millimeter mercury.
Valid units must be of the pressure type.
You can use this form to select from known units:
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.
millimeter mercury to barye
millimeter mercury to kilogram-force/square millimetre
millimeter mercury to kilopond/square centimetre
millimeter mercury to ton/square inch [long]
millimeter mercury to centimeter of water [4 °C]
millimeter mercury to kilopascal
millimeter mercury to millimeter of water [4 °C]
millimeter mercury to hectopascal
millimeter mercury to megapascal
millimeter mercury to millimeter water [4 °C]