standard atmosphere

noun

Definition of standard atmosphere

  1. 1 :  an arbitrary ideal set of atmospheric conditions (as used in calculations of aircraft performance); specifically :  the international standard specifying a temperature of 15° C and 760 millimeters pressure at sea level with a vertical temperature gradient of −6.5° C per kilometer up to 11 kilometers altitude and uniform temperature of −56.5° C above that level

  2. 2 :  atmosphere 5

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