pi*radius squared*velocity
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The flow rate is simply the volume moved in a specific time; divide the volume by the time.
The purpose of a flow meter is to measure the flow of either air or water. They allow one to measure the total volume of air or liquid flow and the rate of the flow.
"SCFH" stands for Standard Cubic Feet per Hour. This is a volumetric flow rate which is used for gases such as air. Since the volume of gases can change dramatically by pressure, a "Standard" is needed to bring the volume to a commonly known value (at sea level). The volume for liquids is typically incompressible and thus does not need a "standard" pressure when calculating volume or volumetric flow rates.
Rate is equal to portion divided by base
The flow rate is 50 ml per 10 min = 5 ml per minute.