• noun a unit of pressure equal to about 133.3 pascal or one conventional millimetre of mercury
  • (written as Torr)
    Unit of pressure equal to 1mm of Mercury and now obsolete. Named after Evangelista Torricelli (1806–1647), the Italian scientist who discovered the principle of the barometer and so provided the means of measuring atmospheric pressure.
  • A unit of pressure equal to about 133.3224 pascals, 1.31579 × 10-3 atm., 1.333224 × 10-3 bar, or 0.9999998 mmHg.

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