View source for Cubic metre per second

{{Short description|SI unit of volumetric flow rate}}
{{one source|date=December 2018}}
{{Infobox unit
| name = Cubic metre per second
| image =
| caption =
| standard = [[SI]]
| quantity = [[volumetric flow rate]]
| symbol = m<sup>3</sup>/s
| dimension = L<sup>3</sup>·T<sup>−1</sup>
| namedafter = 
| extralabel = In [[SI base unit]]s
| extradata = [[metre|m]]<sup>3</sup>·[[Second|s]]<sup>−1</sup>
}}

'''Cubic metre per second''' or '''cubic meter per second''' in [[Metre#Spelling|American English]] (symbol '''m<sup>3</sup>{{sdot}}s<sup>−1</sup>''' or  '''m<sup>3</sup>/s''') is the unit of [[volumetric flow rate]] in the [[International System of Units]] (SI). It corresponds to the exchange or movement of the volume of a [[cube]] with sides of {{convert|1|m|in|spell=in|sigfig=4}} in [[length]] (a [[cubic meter]], originally a ''[[stere]]'') each [[second]]. It is popularly used for water flow, especially in [[river]]s and [[stream]]s, and fractions for [[HVAC]] values measuring air flow.

The term '''''cumec''''' is sometimes used as an acronym for full unit name,<ref name="Row" /> with the plural form ''cumecs'' also common in speech.{{fact|date=November 2015}} It is commonly used between workers in the measurement of water flow through natural streams and civil works, but rarely used in writing.  

Data in units of m<sup>3</sup>{{sdot}}s<sup>−1</sup> are used along the [[y-axis]] or vertical axis of a flow [[hydrograph]], which describes the time variation of discharge of a river (the [[mean]] velocity multiplied by cross-sectional area).  A moderately sized river discharges in the order of 100 m<sup>3</sup>{{sdot}}s<sup>−1</sup>.

==Conversions==
{|
|-
|1 [[cubic metre]] per second&nbsp;
|=&nbsp;  ||align=right|          {{val|1000}}&nbsp;||[[litre]]s per second
|-
|||=&nbsp;||align=right|            {{val|60}}&nbsp;||kilolitres per minute
|-
|||=&nbsp;||align=right|          {{val|86.4}}&nbsp;||megalitres per day
|-
|||=&nbsp;||align=right|       {{val|31.5576}}&nbsp;||gigalitres per year
|-
|||≈&nbsp;||align=right|    {{val|219.969248}}&nbsp;||[[imperial units|imperial]] [[gallon]]s per second
|-
|||≈&nbsp;||align=right|    {{val|264.172051}}&nbsp;||[[United States customary units|US]] gallons per second
|-
|||≈&nbsp;||align=right|     {{val|35.314454}}&nbsp;||[[cubic feet per second]]
|-
|||≈&nbsp;||align=right|         {{val|1.305}}&nbsp;||[[cubic yard]]s per second
|-
|||≈&nbsp;||align=right|     {{val|25566.497}}&nbsp;||[[Acre-foot|acre-feet]] per year
|-
|||≈&nbsp;||align=right|    {{val|1113676621}}&nbsp;||[[cubic feet]] per year
|-
|||≈&nbsp;||align=right| {{val|0.00757090916}}&nbsp;||[[cubic miles]] per year
|}

== References==
{{Reflist|refs = <ref name="Row">
   "Units: C", The University of North Carolina at Chapel Hill, webpage:
   [http://www.unc.edu/~rowlett/units/dictC.html UNC-Rowlett]. [https://web.archive.org/web/20180602224610/https://www.unc.edu/~rowlett/units/dictC.html Archived] on June 2, 2018.
</ref>}}

==See also==
* [[Standard litre per minute]]
* [[Conversion of units]]
* [[Volumetric flow rate]]
* [[Volumetric flux]]
* [[Cusec]], shorthand for cubic feet per second

{{DEFAULTSORT:Cubic Metre Per Second}}
[[Category:Units of flow]]
[[Category:SI derived units]]