**Full name:** millimeter mercury [0 °C]

**Plural form:** millimeters mercury

**Symbol:** mm Hg

**Alternate spelling:** mm mercury

**Category type:** pressure

**Scale factor:** 133.32239

The SI derived unit for pressure is the pascal.

1 pascal is equal to 0.00750061561303 mm Hg.

Valid units must be of the **pressure** type.

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The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure. It is the atmospheric pressure that supports a column of mercury 1 millimetre high. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643.

mm Hg to zeptopascal

mm Hg to pound/square foot

mm Hg to kilopond/square millimeter

mm Hg to barye

mm Hg to meter of air [15 °C]

mm Hg to inch of water [4 °C]

mm Hg to ounce/square inch

mm Hg to foot of head

mm Hg to inch of air [15 °C]