Why is the ratio of the velocity at any point downstream of the throat of a supersonic

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Why is the ratio of the velocity at any point downstream of the throat of a supersonic nozzle to the velocity at the throat (where it equals the speed of sound), though dimensionless, not a Mach number?

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Fundamentals Of Gas Dynamics

ISBN: 9781119481690

3rd Edition

Authors: Robert D Zucker, Oscar Biblarz

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