average rate of flow

in polarography
The ratio of the mass of a drop, at the instant when it is detached from the tip of the capillary, to the drop timet 1; the average value of the instantaneous rate of flow over the entire life of the drop.
PAC, 1985, 57, 1491 (Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)) on page 1503