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 Rider on it. When the car is placed inside of it, it can be charged up and let loose at high speed. Later, "Mach Rider" was released as part of the "Nintendo Vs. Series" arcade variations. It was essentially a modified version of the Endurance Course from the original game. Each time the player completed a level, a bit more of an image was gradually revealed of a woman with a dagger appears next to Mach Rider's bike. While "Mach Rider" has not gained a true sequel, many elements from the game, such as the futuristic setting, incredible high speeds and