Critical Mach number M crit is the free stream Mach number at which, somewhere on the airframe, the local flow Mach number just touches unity. M crit is often in the range of 0.9 and is typically 1.0 in general.
The critical Mach number refers to the aircraft's speed during this aerodynamic effect. The lowest Mach number at which the airflow over a particular spot of the aircraft achieves the speed of sound is known as the critical Mach number (Mcr or M*) of an aircraft.
When comparing the speed of any item with the speed of sound, the Mach number is a crucial factor.
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