Flow rate refers to the quantity of fluid that flows in a unit of time. Where weight is the unit of quantity it is mass flow rate, while for volume, it is volumetric flow rate.
The units of time are s (second), min (minute), h (hour) and d (day).
For example:
l/s, l/min, m3/s, m3/min, m3/hr, m3/day, g/s, g/min, gh/h, t/h, t/d are used. m3/s, m3/min, and m3/h are the most common, and for small flow rates SNM also uses l/min.
In the U.S. or Britain, or countries influenced by them, gal/min (GPM: Gallon Per Minute) is commonly used, and in U.S.-based systems it is U.S. gal/min, while in British-based systems it is IMP gal/min, the difference between which is:
1 IMP gal/min = 1.2009 U.S. gal/min
1 m3/min = 219.98 IMP gal/min = 264.18 U.S. gal/min
In other words, there is roughly a 20% difference between an IMP gal/min and a U.S. gal/min and if the measure given is simply gal/min, it is necessary to double check which unit is being used.
Mass flow rate is affected by density, which means that its relation to volumetric flow is as follows.
volumetric flow rate = mass flow rate / density
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