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on Nov 20th 2004, 23:01:13, John wrote the following about

Sound

Mach isn't an acronym, but is in fact named after the Austrian physicist Ernst Mach, who in 1877 published an important scientific paper laying out the principles of supersonics. He also came up with the Mach number, which is the ratio of the velocity of an object to the velocity of sound. A plane traveling at the speed of sound, therefore, has a Mach number of 1. It's important to note that Mach 1 doesn't simply stand for the speed of sound, but rather the speed of an object traveling at the speed of sound.


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