Mach number temperature generally decreases with increasing altitude between sea level and , the speed of sound also decreases. For example, the standard atmosphere model lapses temperature to at altitude, with a corresponding speed of sound (Mach1) of , 86.7% of the sea level value. While the terms "subsonic" and "supersonic", in the purest sense, refer to speeds below and above the local speed of sound respectively, aerodynamicists often use the same terms to talk about particular ranges of Mach values. This occurs because of the presence of a "transonic regime" around M = 1 where approximations of the Navier-Stokes equations used
Mach 2 (film) United States Presidential Seal on the cabin divider walls. Several movie errors were shown: the steering column clearly shown onscreen is a vertical type, unlike Concorde's one is shaped like the letter "m". It also features advanced LCD primary flight displays, but Concorde's display is just dials or analog style. Mach 2 (film) Mach 2 is a 2001 American direct-to-video action disaster thriller film directed by Fred Olen Ray. It was the first film to feature the airliner Concorde being hijacked. U.S. Senator Stuart Davis, running against the Vice-President, plans a trip to the Balkans to negotiate the release of