The ratio of the measured relieving capacity to the theoretical relieving capacity. ( 557)

mathematical function that that defines the ration between "true" flow and "indicated" flow used primarily with differential pressure devices and plotted against Reynolds number.

(or discharge coefficient) Ratio of actual mass flow rate through some orifice or nozzle to "theoretical" mass flow rate evaluated for a hypothetical ideal convergent nozzle having the same critical cross-sectional area. It is defined as: .