torr(redirected from Conventional millimetre of mercury)
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n. pl. torr
A unit of pressure that is equal to approximately 1.316 × 10-3 atmosphere or 133.3 pascals.
[After Evangelista Torricelli.]
n, pl torr
(Units) a unit of pressure equal to one millimetre of mercury (133.322 newtons per square metre)
[C20: named after E. Torricelli]
a unit of pressure, being the pressure necessary to support a column of mercury one millimeter high at 0°C and standard gravity, equal to 1333.2 microbars.
[1945–50; after E. Torricelli]