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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