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 Five his crew, and with other racers. Functions are not activated by a steering wheel hub lettered A-G, but instead, by switches mounted around the steering wheel. The Mach 6 succeeded the Mach 5 as the main vehicle for the rest of the series. More of the original gadgets were gradually revealed (such as the sludge slick) and used in future episodes. Eventually, the Mach 5 returned as Speed Racer Sr.'s main car in the season 2 premiere. Mach Five The is the racing car Speed Racer (Go Mifune in the Japanese version) drives in the anime series of the same