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) it is equivalent to the SI derived unit cubic hectometer per second (symbol: hm 3/s or hm 3⋅s −1). 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). Another unit used is standard cubic centimetres per minute (SCCM). The SI unit is cubic metres per second (m 3/s). In physics and engineering, in particular fluid dynamics, the volumetric flow rate (also known as volume flow rate, rate of fluid flow, or volume velocity) is the volume of fluid which passes per unit time usually it is represented by the symbol Q (sometimes V̇).
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