Flow Variable
A variable that measures something over an interval of time, such as your income per week.
A flow variable is a variable that measures the rate of flow of a certain fluid or substance. In other words, it is a variable that varies with the amount of substance flowing per unit of time. The most common types of flow variables are volume flow rate, mass flow rate, and velocity.
Volume flow rate is the amount of fluid that passes through a given point in a given amount of time, expressed in units of volume per unit of time (such as liters/minute or cubic meters/second). Mass flow rate, on the other hand, is the amount of mass (in terms of weight) flowing per unit of time, expressed in units of mass per unit of time (such as kilograms/second or pounds/minute).
Velocity is a measure of the speed of the fluid or substance as it flows through a given point, expressed in units of distance per unit of time (such as meters/second or feet/minute). In many cases, velocity can be related to volume flow rate and mass flow rate by multiplying the cross-sectional area of the flow path by the velocity at a given point.
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