Pressure Altitude: Why is it important? - KINGSCHOOLS.COM
Civil Aviation : The Altimeter and Height Levels on an Airplane
What is QNH?
Altimeter setting is the value of the atmospheric pressure used to adjust the sub-scale of a pressure altimeter so that it indicates the height of an aircraft above a known reference surface. This reference can be the mean sea level pressure (QNH), the pressure at the nearby surface airport or the pressure level of 1,013.25 hectopascals which gives the standard flight levels
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