the process the control-volume is undergoing
(=> (Undergoing $X $Y) (Steady-State-Steady-Flow-Process $Y)) (=> (Undergoing $X $Y) (Control-Volume $X)) (Forall (?Self) (<=> (Steady-Flow-Throttling ?Self) (And (Steady-Flow-Expansion ?Self) (Steady-Flow-Adiabatic-Process ?Self) (Process-Cv ?Self ?Cv) (Undergoing Steady-Flow-Throttling ?Cv))))