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.
References in periodicals archive ?
Sports Record can also reveal that the player has told sportswear giants Umbro that he may be back home before Thursday when he is scheduled to appear in London at the glitzy launch of the firm's new Mach Speed boot along with other stars such as Michael Owen, Alan Shearer and Tore Andre Flo.
Larsson has told sportswear firm Umbro that he may be back home before Thursday, when he is scheduled to appear in London at the launch of the company's new Mach Speed.
The controller picked this time to ask me my plane's Mach speed. I replied, "Mach 0.54."
Nike and Oregon have unveiled the new "Mach Speed" uniforms the Ducks will be wearing at the Alamo.
USA, Data Station, Inc., IMA-Hong Kong, Ltd., Impecca USA, Inc., iRiver, Inc., Koninklijke Philips Electronics N.V., Lasonic Electronics Corp., LG Electronics U.S.A., Inc.,, LG Electronics, Inc., LG Electronics Mobilecomm U.S.A., Inc., Mach Speed Technologies, Inc., Meizu Technology Co., Ltd., Microsoft Corp., Philips Electronics North America Corp., Spectra Merchandising International Inc.
I'm paraphrasing here, but the actual title was more like "Juvenilium molestorum coverupum avoidum erat." The pope's posse inadvertently showed they can move at mach speed to save marriage from marauding gays but glacial speed when it comes to saving children from molesting priests.