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 Rider Blue, further reinforcing the connection between the two series. The remix returned in later titles "Super Smash Bros. Brawl" and "Super Smash Bros. for Wii U". There is also a collectible Mach Rider trophy in "Melee", and a Mach Rider sticker in "Brawl". In "Mario Kart Wii", a vehicle called the "Mach Bike" resembles the bike in "Mach Rider". In addition, a similar vehicle also appeared in "Mario Kart 8", known as the "Sport Bike". In "", one of the many minigames is based on "Mach Rider". Mach Rider It was released on the Virtual Console for the Wii (2007),