Discussion
Which quantity does the entropy of an ideal gas depend on?
Answer: C
For an ideal gas the specific entropy is the specific heat at constant pressure times the logarithm of the potential temperature, plus a constant. This is why an adiabatic reversible process, which conserves entropy, also conserves potential temperature. The identification makes isentropic and constant potential temperature surfaces the same thing. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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