An isentropic process is one for which there is no heat transfer withthe surroundings, and no change in entropy
(Forall (?Self ?Time) (=> (Active ?Time Steady-Flow-Isentropic-Process ?Self) (Forall (?Cv) (=> (Process-Cv ?Self ?Cv) (= (Lambda (?T) (If (= ?T ?Time) (Value-At (D-Entropy-Rate ?Cv) ?T))) 0))))) (Forall (?Self ?Time) (<=> (Active ?Time Steady-Flow-Isentropic-Process ?Self) (And (Steady-Flow-Isentropic-Process ?Self) (Active ?Time Steady-Flow-Adiabatic-Process ?Self))))