Pressure Definitions

QFE – The pressure measured at the aerodrome reference point. 

QFF – QFE converted to mean sea level using the actual temperature. 

QNH – QFE converted to mean sea level using the ISA. 

ISOBAR – A line joining places of the same atmospheric pressure (usually MSL pressure QFF). 

Standard Pressure Setting (SPS) 1013 hPa 

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