Inch of mercury
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Inches of mercury, inHg or "Hg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered a bit old in other countries.
It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.
- 1 inHg = 3,386.389 pascals at 0 °C.
Aircraft flying at higher altitudes (at or above what is called the Transition Altitude, which varies by country) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.
See also
- Torr (millimeters of mercury)
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