Standard pressure altitude
From Glossary of Meteorology
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standard pressure altitude
The altitude that corresponds to a given value of atmospheric pressure according to the ICAO standard atmosphere.
It is the indicated altitude of a pressure altimeter at an altimeter setting of 29.92 in. of mercury (1013.2 hPa); therefore, it is the indicated altitude above the 1013.2-hPa constant- pressure surface.
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