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Mach number is defined as the ratio of local flow velocity to the _______

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Mach number is defined as the ratio of local flow velocity to the _______

(a) Speed of sound in vacuum

(b) Local speed of sound

(c) Speed of light

(d) Speed of sound at 25°C

I had been asked this question in my homework.

I need to ask this question from Definition of Compressibility topic in division Compressible Flow – Preliminary Aspects of Aerodynamics

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Right choice is (b) Local speed of sound

The explanation is: The Mach number is not related to the speed of light. It is defined as the ratio of local speed of flow to the local speed of sound. The local speed varies with temperature and pressure in that region.

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