An isobaric process is a constant pressure process
(Forall (?Self ?Time) (=> (Active ?Time Steady-Flow-Isobaric-Process ?Self) (Forall (?Cv) (=> (Process-Cv ?Self ?Cv) (= (Lambda (?T) (If (= ?T ?Time) (Value-At (Stream-Pressure (Inlet-Stream ?Cv)) ?T))) (Lambda (?T) (If (= ?T ?Time) (Value-At (Stream-Pressure (Outlet-Stream ?Cv)) ?T)))))))) (Forall (?Self ?Time) (<=> (Active ?Time Steady-Flow-Isobaric-Process ?Self) (And (Steady-Flow-Isobaric-Process ?Self) (Active ?Time Steady-State-Steady-Flow-Process ?Self))))