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That number is named after the Physicist Ernst Waldfried Josef Wenzel Mach,

an Austrian physicist and philosopher. In German, his name is pronounced 'mock'.

Among other subjects, he studied sound in air, and the structure of shock waves.

It's often useful to talk about "How many times the speed of sound are we moving ?"

and that's the number named for Mach. For example, a speed of "Mach 2.1" is

2.1 times the speed of sound in the air that the object is moving through.

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