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Originally Answered: What is a Mach number? It is the ratio of velocity of an object to the velocity of sound. If the Mach no is one then object is moving with the velocity of sound.
Mach number is defined as the ratio of speed of the body to the speed of the sound. M = V/a. Mach number allows us to define different flight regimes in which compressibility effects vary. If M < 0.8, then the flow is Subsonic. If 0.8 < M < 1, then the flow is Transonic. If M = 1, then the flow is Sonic.