Millimeter of mercury (mmHg)
Definition
The conventional millimeter of mercury, exactly 101325/760 pascals (about 133.322 Pa), equal to the torr.
History
The millimeter of mercury comes from mercury barometers, where pressure was read as the height of a mercury column. It is now fixed conventionally as one 760th of a standard atmosphere, essentially equal to the torr.
Where it is used
mmHg is the standard unit for blood pressure — a reading of 120/80 mmHg — and for measuring vacuums.
Typical uses include blood pressure, vacuum measurement.
Conversion pages
These pages convert millimeter of mercury to or from another unit in pressure.
No conversion pages use this unit yet.