in SI units it is m3 / second Also it can be in litres / second (LPS)
Gallons per minute (GPM) is also another way of denoting it
Mass flow rate means how much mass flows in certain time. Therefore the unit are: mass per unit time for example: kg/hour lb/min ton/year ton/second
I guess that would be power (energy per unit time), i.e. Joules per second, a.k.a. Watts.
we have a gilibrator2 calibration system and it says that is cubic centimeters per minute.
3 gpm
Water flow is measured in liters per second in the SI system.