Meteorology
Pressure altitude
At a glance
Meaning of Pressure altitude
Altitude referenced to the standard pressure setting of 1013.25 hPa.
More about Pressure altitude
Pressure altitude is the altimeter indication with standard pressure selected. It refers to a pressure surface and need not equal actual height above mean sea level.
It is used in performance calculations and flight-level references. An altitude indicated with QNH can differ when local pressure is not standard.