Orfice meters,venturi meters, rotameters, and displacement meters are used extensively in industrial operations for measuring the rate of liquid flow.
an increase in height increases the length
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
you use the equation m=pv where m is the mass flow rate ,p is the density, v is the volumetric flow rate
higher temperature equals more flow, which reduces mpg.