Inch of Mercury

**Semantic type:** Quantitative Concept

**Definition:** A measurement of the pressure exerted by a column of mercury of 1 inch in height at the standard acceleration of gravity. This measurement is used for barometric pressure in aviation, refrigeration, and weather reports. The conversion to metric units is dependent upon the temperature of the mercury.

**Synonyms:** - Inches of Mercury - [in_i'Hg] - [in_i'Hg] - in_i'h/i'Hg] - inch of mercury column - inch of mercury column