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In aviation, pressure altitude is the indicated altitude when an altimeter is set to 1013 hPa (29.92 inHg US and Canada). It is primarily used in aircraft performance calculations, and in high-altitude flight (Class A airspace in the United States, which is controlled airspace at or above 18,000 feet). The relation between static pressure and pressure altitude is defined in terms of the properties of the International Standard Atmosphere (ISA). Up to 36,090 ft this relation can be expressed as: Where:
Simplification One simplification of the Pressure Altitude that is a bit more practical to pilots than the above formula is the following: Where See also | ||||||||
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