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Mach number
Definição1
The ratio of the velocity of a body to that of sound in a surrounding medium. A Mach number of 0.8 or 1.2 means that the aircraft is flying at 0.8 or 1.2 times, respectively, the local speed of sound at that ambient temperature. Also known as relative Mach number.
Fonte1
KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
Fonte2
AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL. RBAC 01: regulamentos brasileiros de aviação civil. Definições, regras de redação e unidades de medida. [S.l.], 2008. (Regulamentos Brasileiros de Aviação Civil).
Fonte3
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Air traffic management. 15th ed. Montreal, 2007. (Doc. 4444- ATM/ 501)
Contexto
When the 10-minute longitudinal separation minimum with Mach number technique is applied, the preceding aircraft shall maintain a true Mach number equal to or greater than that maintained by the following aircraft.
Français
nombre de Mach
Imagem

 An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.

An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.

Fonte: http://en.wikipedia.org/wiki/File:FA-18_Hornet_breaking_sound_barrier_%287_July_1999%29.jpg