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- Definição1
- The internationally accepted conditions of the atmosphere to allow all measurements to be brought to the same norms. The standard atmospheric conditions at sea level are pressure: 29.92 in of mercury or 1013.2 hectopascals; temperature: 15ºC; acceleration due to gravity: 32,174 ft/s2 or 9.809 m/s2; air density: 0.002378 slugs/ft3 or 1.225 kg/m3; and speed of sound: 761 miles/h, 1116.4 ft/s, 1225.35 km/h or 34,046.16 cm/s. The temperature lapse rate is assumed to be constant at the rate of 1.98ºC per 1000 ft (6.5ºC per kilometer) up to a height of 36,090 ft (11 km), above which it remains constant at -56.5ºC.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Definição2
- A hypothetical atmosphere based on averages in which the surface temperature is 59ºF (15ºC), the surface pressure is 29.92 in. Hg (1013.2 Mb) at sea level, and the temperature lapse rate is approximately 3.5ºF (2ºC) per 1,000 feet.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: http://www.faa.gov/library/manuals/aircraft/media/faa-h-8083 -21.pdf. Acesso em: 10 fev. 2012.
- Fonte3
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft operations: flight procedures. 5.ed. Montreal, 2006. Volume 1. (Doc. 8168)
- Contexto
- The calculated minimum safe altitudes/heights must be adjusted when the ambient temperature on the surface is much lower than that predicted by the standard atmosphere.
- Subárea1
- Meteorology
- Related Term
- international standard atmosphere
- Português
- atmosfera padrão