Mach number which was also unit-first, and may have influenced the use of the term Mach. In the decade preceding faster-than-sound human flight, aeronautical engineers referred to the speed of sound as "Mach's number", never "Mach 1". Mach number is useful because the fluid behaves in a similar manner at a given Mach number, regardless of other variables. As modeled in the International Standard Atmosphere, dry air at mean sea level, standard temperature of , the speed of sound is . The speed of sound is not a constant; in a gas, it increases as the absolute temperature increases, and since atmospheric
Mach Five kind of terrain (firm, icy, unsteady ground, and significant slopes). Control G = Homing robot (As in the original) When pressed, the Mach Five releases a remote control robot bird capable of transmitting footage back to the Mach Five from wherever it is. This function wasn't used in the film. In the 1959 movie "On the Beach" Dr Julian Osborne (played by Fred Astaire) races in a white number 5 Ferrari while wearing a white helmet and goggles—eerily similar to Speed Racer in the Mach Five. In the animated 2008 series, which takes place about 40 years after the events