Flow rate

Flow rate may refer to:


 * Flow measurement, a quantification of bulk fluid movement
 * Mass flow rate (ṁ or μ), the mass of a substance which passes per unit of time
 * Volumetric flow rate ($Q$ or $$\dot V$$), the volume of fluid which passes per unit time
 * Discharge (hydrology) ($Q$), volume rate of water flow that is transported through a given cross-sectional area, such as a river