Upto what value of 'Mach number', a fluid may be considered as incompressible ?
Correct answer: B. 0.3
- A. 0.03
- B. 0.3
- C. 3
- D. 10
Explanation
For gases and liquids, compressibility effects are usually negligible when the Mach number is below about 0.3. At higher Mach numbers, pressure changes produce appreciable density changes, so treating the fluid as incompressible becomes unreliable.
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