Discussion
In an isentropic process there is no change in :
Answer: B
In an isentropic process there is no change in heat, that is, no heat is exchanged.
An isentropic process is one at constant entropy. Since \(dS = dQ_{rev}/T\), constant entropy in a reversible process means dQ = 0: the process is reversible and adiabatic. The dry adiabatic ascent of an air parcel is the standard example, and it is why potential temperature, which is tied to entropy, is conserved.
Temperature, volume and pressure all change in such a process: a rising parcel expands and cools as its pressure falls. Isothermal, isochoric and isobaric processes are the ones that keep those quantities fixed.
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