inch of mercury

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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/s²or approximately 32.17398 ft/s²; equal to 3386.388640341 pascals; used as a unit in the measurement of atmospheric pressure.

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