Question: What do you mean by sub sonic, sonic and supersonic flows?

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**Sub sonic flow**: A flow is said sub sonic flow if Mach number is less than 1 i.e velocity of flow (V) is less than the velocity of the sound wave (C).

**Sonic flow**: A flow is said sonic flow if Mach number is equal to 1 i.e velocity of flow is equal to the velocity of the sound wave.

**Super sonic flow**: A flow is said super sonic flow if Mach number is greater than 1 i.e velocity of flow is greater than the velocity of the sound wave.

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