Discussion
Assertion (A): Compressibility may safely be ignored below about Mach 0.3.
Reason (R): Below that Mach number the density varies by less than about five per cent through the field.
Select the correct answer from the options below.
Answer: B
Both are true and the second is the reason for the first. The threshold is chosen by accepting a five per cent density variation as negligible, and working backwards through the isentropic relation puts that at roughly Mach 0.3. It is a convention, not a physical discontinuity in the flow.
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