Volume flow has the dimension length cubed over time. The SI composite unit of volume flow is the cubic meter per second.

Maple knows the units of volume flow listed in the following table.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, gallon_per_minute[US_liquid] or cfm[standard]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, gallon_per_minute or cfm.

The units of volume flow are defined as follows.

A US liquid, US dry, or UK gallon per minute is defined as a gallon of the same context per minute.

A standard cubic foot per minute is defined as a cubic standard foot per minute.