A standard atmosphere has been defined by the International Civil Aeronautical Organization (ICAO). It assumes a mean sea level temperature of 15°C a standard sea level pressure of 1,013.25 millibars or 29.92 inches of mercury, and a temperature lapse rate of 0.65°C per 100 meters up to 11 kilometers in the atmosphere.
STANDARD ATMOSPHERE
Meaning of STANDARD ATMOSPHERE in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012