# Volumetric flow rate

## Volume of fluid which passes per unit time / From Wikipedia, the free encyclopedia

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In physics and engineering, in particular fluid dynamics, the **volumetric flow rate** (also known as **volume flow rate**, or **volume velocity**) is the volume of fluid which passes per unit time; usually it is represented by the symbol Q (sometimes ${\dot {V}}$). It contrasts with mass flow rate, which is the other main type of fluid flow rate. In most contexts a mention of *rate of fluid flow* is likely to refer to the volumetric rate. In hydrometry, the volumetric flow rate is known as *discharge*.

This article needs attention from an expert in Physics or Engineering. The specific problem is: Lacks treatment of compressible flow. See the talk page for details. (May 2023) |

**Quick Facts**Volume flow rate, Common symbols ...

Volume flow rate | |
---|---|

Common symbols | Q, ${\dot {V}}$ |

SI unit | m^{3}/s |

Dimension | ${\mathsf {L}}^{3}{\mathsf {T}}^{-1}$ |

Volumetric flow rate should not be confused with volumetric flux, as defined by Darcy's law and represented by the symbol q, with units of m^{3}/(m^{2}·s), that is, m·s^{−1}. The integration of a flux over an area gives the volumetric flow rate.

The SI unit is cubic metres per second (m^{3}/s). Another unit used is standard cubic centimetres per minute (SCCM). In US customary units and imperial units, volumetric flow rate is often expressed as cubic feet per second (ft^{3}/s) or gallons per minute (either US or imperial definitions). In oceanography, the sverdrup (symbol: Sv, not to be confused with the sievert) is a non-SI metric unit of flow, with 1 Sv equal to 1 million cubic metres per second (260,000,000 US gal/s);^{[1]}^{[2]} it is equivalent to the SI derived unit cubic hectometer per second (symbol: hm^{3}/s or hm^{3}⋅s^{−1}). Named after Harald Sverdrup, it is used almost exclusively in oceanography to measure the volumetric rate of transport of ocean currents.