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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:


z =\left (1-\left( rac{P_o}{1013.25} ight)^{0.190263} ight ) imes rac{288.15}{0.00198122}


Where:

  • z = pressure altitude (feet)

  • P_o = static pressure (hPa)




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