inch of mercury


inch of mercury

[′inch əv ′mər·kyə·rē] (mechanics) The pressure exerted by a 1-inch-high (2.54-centimeter) column of mercury that has a density of 13.5951 grams per cubic centimeter when the acceleration of gravity has the standard value of 9.80665 m/s2 or approximately 32.17398 ft/s2; equal to 3386.388640341 pascals; used as a unit in the measurement of atmospheric pressure.