Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ?
Correct answer: A. < 0.3
- A. < 0.3
- B. > 3
- C. 50
- D. 1
Explanation
Gas compressibility effects are usually negligible when the Mach number is below about 0.3, because pressure disturbances travel much faster than the flow.
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