ruumiline maht mõõtetingimustel jagatud ajaga, quantity equal to the volume dV of substance crossing a given surface during a time interval with infinitesimal duration dt, divided by this duration, thus qV = dV / dt, flow rate in which the quantity of fluid is expressed as volume, volume at metering conditions divided by time, voolava keskkonna vookogus, mis on väljendatud mahuna, volume of fluid passing through the primary device per unit time