Role of the Mach Number - Glenn Research Center | NASA The Mach number is the ratio of the speed of the aircraft, or the speed of the gas, to the speed of sound in the gas The speed of sound is equal to the speed of transmission of small, isentropic disturbances in the flow
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Mach number | Description Facts | Britannica Mach number, in fluid mechanics, ratio of the velocity of a fluid to the velocity of sound in that fluid, named after Ernst Mach (1838–1916), an Austrian physicist and philosopher