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 1 Racing the 1990 Daytona 500. Mach 1 Racing Mach 1 Racing was a NASCAR Winston Cup Series team. It was owned by Hollywood stuntman Hal Needham and actor Burt Reynolds. The team made its debut in 1981, fielding the No. 22 Skoal Pontiac driven by Stan Barrett. Barrett ran ten races for the team that season, his best finish coming at Talladega Superspeedway, where he finished 9th. Midseason, Mach 1 created a second car, the No. 33, driven by Harry Gant. Gant did not win that season, but he won three poles and had thirteen top-tens, finishing third in points. In