Mach number e machthe ratio of the speed of an object in a, Ask an Expert

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Mach number (E. Mach):

The ratio of the speed of an object in a provided medium to the speed of sound within that medium.

Mach's principle (E. Mach; c. 1870)

The inertia of any specific particle or particles of matter is attributable to the interaction among that piece of matter & the rest of the Universe. Therefore, in isolation a body would have no inertia.

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