Discussion
When the Mach number is less than unity, the flow is called:
Answer: C
Flow with a Mach number below one is Sub-Sonic flow.
The Mach number is the ratio of the flow velocity to the local speed of sound. When it is less than 1, the flow moves slower than sound, so pressure disturbances can travel upstream.
Mach 1 is sonic flow, Mach numbers above 1 (up to about 5) are supersonic, and above about 5 hypersonic. So Mach less than unity can only be subsonic.
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