millimeter of mercury

millimeter of mercury
(mm Hg)
   a unit of pressure equal to the pressure exerted at the Earth's surface by a column of mercury 1 millimeter high. When a traditional mercury barometer is used, the pressure is read directly as the height of the mercury column in millimeters. One millimeter of pressure is equivalent to approximately 0.03937 in Hg, 0.01933 lbf/in2, 1.333 millibars, or 133.3 pascals. In medicine, blood pressure is traditionally recorded in mm Hg. In engineering, the millimeter of mercury is often replaced by the torr, the two units being equal to within 1 part per million. Hg, the chemical symbol for mercury, is taken from the Latin hydrargyrum, "water-silver," describing the silvery liquid metal.

Dictionary of units of measurement. 2015.

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