SINCE 1828
standard atmosphere
nounDefinition of standard atmosphere
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
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