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

**Plural form:** millimeters of mercury

**Symbol:** mmHg

**Alternate spelling:** mm of mercury

**Category type:** pressure

**Scale factor:** 133.32239

The SI derived unit for pressure is the pascal.

1 pascal is equal to 0.00750061561303 mmHg.

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.

mmHg to microbar

mmHg to pound/square foot

mmHg to newton/square metre

mmHg to dyne/square centimetre

mmHg to millimeter of water [4 °C]

mmHg to yottapascal

mmHg to centimeter water [4 °C]

mmHg to pieze

mmHg to water column [centimeter]