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Definition of: mach number
(mak, mäk)
A number expressing the speed of an object moving through a fluid medium in relation to the speed of sound in the same medium: in aeronautics it is the ratio of the air speed to the speed of sound in the undisturbed medium, a mach number of 1 indicating a speed equal to the speed of sound. Also mach. [after Ernst Mach, 1838–1916, Austrian physicist]
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