coefficient, defined for an incompressible fluid flow, which relates the actual flow rate to the theoretical flow rate through a device, and is given by the formula for incompressible fluids, tegeliku tühjenemise ja ideaalse tühjenemise suhe, ratio of the mass flow rate to theoretical one of real gas at the same inlet stagnation condition, vedelikuvootegur, mis seob tegeliku voomahu läbi mõõtevahendi kulgeva teoreetilise voomahuga ja on arvutatav kokkusurumatute vedelike valemiga