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Back to: "I"international standard atmosphere
- Definição1
- Atmosphere in which the sea level pressure is 1013.25 hectopascals, temperature is 15ºC, air density is 0.002378 slugs/ft3 or 1.225 kg/m3, acceleration due to gravity is 32.174 ft/s2 (9.809 m/s2), and the speed of sound is 761 mph, or 1116.4 ft/s (1225.35 km/h). It has a uniform lapse rate until the temperature drops to -56.5ºC, at 36,090 ft (11 km), after which the temperature is constant until tropopause. All aerodynamic calculations are based on the ISA.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft operations: construction of visual and instrument flight procedures. 6.ed. Montreal, 2014. Volume 2. (Doc. 8168)
- Nota adicional1
- Acronym in English: ISA.
- Contexto
- Where climatological data are available the maximum temperature within the 95 per cent probability should be used for calculations. Where adequate climatological data are not available, the international standard atmosphere (ISA) plus 15\xB0 Celsius temperature gradient should be used.
- Subárea1
- Meteorology
- Related Term
- standard atmosphere
- Português
- atmosfera padrão internacional