Atmosphere and standard atmosphere · Question 2 of 12
Which values apply at sea level in the ICAO standard atmosphere (ISA)?
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Answer
- C 15 °C and 1 013.25 hPa
Explanation
At mean sea level the ISA defines 15 °C and 1 013.25 hPa. Up to the tropopause at 11 km, the temperature decreases by 6.5 °C per kilometre (about 2 °C per 1 000 ft). Altimeters and airspeed indicators are calibrated to this standard atmosphere.