Mach number

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Mach num·ber

(mahk),
a number representing the ratio between the speed of an object moving through a fluid medium, such as air, and the speed of sound in the same medium.

Mach,

Ernst Waldfried Josef Wenzel, Austrian scientist, 1838-1916.
Mach band - a relatively bright or dark band.
Mach number - the ratio between the speed of an object moving through a fluid medium and the speed of sound in the same medium.