the system consisting of a nozzle, an associated control-volume, and a throttling process.
the nozzle
the control volume associated with the nozzle in the nozzle-system
the throttling process
(Forall (?Self ?Time) (<=> (Active ?Time Nozzle-System ?Self) (And (Nozzle-System ?Self) (Active ?Time System-Model ?Self)))) (=> (Nozzle-System ?Self) (And (Cv-Component (Nzl-Cv ?Self) (Nzl ?Self)) (Component-Cv (Nzl ?Self) (Nzl-Cv ?Self)) (Process-Cv (Thrtlng-Prcs ?Self) (Nzl-Cv ?Self))))