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mach number
Mach number (Ma) (generally pronounce /ˈmɑːk/, sometimes /ˈmɑːx/ or /ˈmæk/) is the speed of an object moving through air, or any fluid substance, divided by the speed of sound as it is in that substance:
Trivia about mach number
The ratio of the speed of an object to the speed of sound is known as this type of number