›› Measurement unit: millimeter mercury

Full name:

Plural form: millimeters mercury

Symbol: mm Hg

Alternate spelling: mm mercury

Category type: pressure

Scale factor: 133.322387415


›› SI unit: pascal

The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006157584566 millimeter mercury.


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›› Definition: Millimeter mercury

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.


›› Sample conversions: millimeter mercury

millimeter mercury to micrometer of water [4 C]
millimeter mercury to kilogram/square centimetre
millimeter mercury to exapascal
millimeter mercury to terabar
millimeter mercury to newton/square metre
millimeter mercury to pound/square foot
millimeter mercury to attopascal
millimeter mercury to ton/square metre
millimeter mercury to micropascal
millimeter mercury to meter of air [15 C]