Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling. It is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air (which is 332 m/s or 1195 km/hr or 717 miles/hour.) An aircraft flying at Mach 2 is flying at twice the speed of sound in air, etc.
Mach 1 = Speed of Sound
Speed of Sound = 332 m/s or 1195 km/hr or 717 miles/hour or 1,125 ft/s
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Mach 1 means the speed of sound. The speed of sound is 343meters per second, 1,126ft/sec or 768mph.
Mach 1 is the speed of sound. 768 miles per hr. Mach 2 is twice that & so on.
0,72 Mach is a subsonic speed. Mach number = speed of an object/speed of sound The speed of sound in dry air at 20 0C is 1 236 km/h.
The speed of sound is around 760 miles per hour = Mach 1. So Mach 4 is 4*760 = 3040 mph.
Mach velocities are all relative to the speed of sound in that gas, at that density. Mach 1 = the speed of sound. Mach 2 = twice the speed of sound. It does not have an invariant conversion into miles per minute.