rate of flow
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|Noun||1.||rate of flow - the amount of fluid that flows in a given time|
cardiac output - the amount of blood pumped out by the ventricles in a given period of time; "a resting adult has a cardiac output of about three quarts a minute"
rate - a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"