That means the speed, compared to the speed of sound. For example, "mach 2" means twice the speed of sound.
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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.
Mach 1 is the speed of sound. 768 miles per hr. Mach 2 is twice that & so on.
Mach 0.8 = about 593.2 mph
The speed of sound is around 760 miles per hour = Mach 1. So Mach 4 is 4*760 = 3040 mph.
Mach 1 means the speed of sound. The speed of sound is 343meters per second, 1,126ft/sec or 768mph.