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Three references for barometric pressure are in common usage. It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 0f 0 0c at the standard acceleration of gravity. Inches of mercury or inhg is a non si unit for pressure.
Qnh the pressure set on the subscale of the altimeter so that the instrument indicates its height above sea level. It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 0f 0 0c at the standard acceleration of gravity. Qnh qfe and standard pressure.
To convert inches of mercury to millibars multiply the inches value by 338637526 to convert millibars to inches of mercury multiply the millibar value by 00295301. Inches of mercury inhg in particular north america. Inches of mercury or inhg is a non si unit for pressure.
Inches hg millibars. Qnh is an aeronautical code q code indicating the atmospheric pressure adjusted to mean sea levelit is a pressure setting used by pilots air traffic control atc and low frequency weather beacons to refer to the barometric setting which when set on an aircrafts altimeter will cause the altimeter to read altitude above mean sea level within a certain defined region. It is still widely used for barometric pressure in weather reports and aviation in the united states but is considered somewhat outdated elsewhere.
Millimetres of mercury cis and some other south east european states. It is still widely used for barometric pressure in weather reports and aviation in the united states but is considered somewhat outdated elsewhere.