Mach number Hear it!

Mach number definition

Mach number (mäk)

a number representing the ratio of the speed of an object to the speed of sound in the surrounding medium, as air, through which the object is moving

Etymology: after E. Mach (1838-1916), Austrian physicist

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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