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It is defined as the pressure exerted by a column of Mercury of 1 Inch in Height at 0 °C at the Standard Acceleration Of Gravity .

:1 inHg = 3386.389 Pascal s at 0 °C.

Aircraft operating at higher altitudes (above 18,000 feet) set their barometric Altimeter s to a standard pressure of 29.92 inHg or 1013.2 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 Level s.