Mach Sign Video
Upload On Tue Aug 16 2011 by ASL STEM
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Definition
The scale measuring the speed of an object or fluid relative to the speed of sound is named for philosopher/physicist Ernst Mach (1838-1916), who researched thermodynamics; Mach is the ratio of the speed of something to the speed of sound in the surrounding medium.
Source: http://www.thefreedictionary.com/Mach
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