Mach Number is defined as the ratio of speed to the speed of sound in the medium in study. Since the speed of sound increases with the increase of temperature, the actual speed of an object travelling on Mach 1 will depend primarily on the fluid temperature around it. The other values upon which the exact mach number depends are: the gas constant of the fluid (R), and the adiabatic index of the gas(). The Mach Number is named after Austrian physicist and philosopher Ernst Mach.
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