Question

“Mach is the Dimensionless quantity”.

(a) True

(b) False

I had been asked this question in homework.

This interesting question is from Classification of Fluids topic in portion Fluid Flow and Mixing of Bioprocess Engineering

Answer 1

Correct choice is (a) True

To explain: In fluid dynamics, the Mach number (M or Ma) is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound.

where:

M is the Mach number,

u is the local flow velocity with respect to the boundaries (either internal, such as an object immersed in the flow, or external, like a channel), and

c is the speed of sound in the medium.