Understanding Altitude references - FlyByWire Simulations
https://docs.flybywiresim.com/pilots-corner/airliner-flying-guide/altitude-refs/
WEBISA is an internationally developed and recognized model of how air pressure, temperature, and density vary with altitude, and for pilots, this means a QNH of 1013 hPa or 29.92 in Hg. To fly a flight level (i.e., FL350 as opposed to 35 000 ft), all aircraft are required to be set to STD to remove any chances of differences between QNH causing ...
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