Discussion
Assertion (A): Cryogenic tunnels raise the Reynolds number without altering the Mach number.
Reason (R): Cooling the gas raises its density and lowers its viscosity together.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second is the reason for the first. Both effects push the Reynolds number the same way, giving roughly a sixfold gain at 110 K, while the Mach number depends on speed relative to the local speed of sound and is set independently.
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