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Let us assume you want the flow rate of water from a pipe such as a garden hose . First, the flow rate must be constant . So don't change the position of the tap handle controlling the outward flow. You need 2 things. A clock with a second hand, and a container which has a known fluid volume, such as a kitchen measuring container (say 1/2Litre capacity. ) Now when the second hand is on 12 quickly let all the water flow into the 1/2 Litre container. When the container is perfectly full to the 1/2Litre marking , very quickly remove the container from the water source and at the same instant, take note of how many seconds and/or minutes it took to fill the container. Suppose it took 45 seconds , then the flow rate measured in 'Litre/ Minute' will be 1/2 Litre in 45/60 minutes. This is of course that same as 0.5 Litre per 0.75 minute which equals 0.5 divided by 0.75 Litre/ minute. Answer is therefore 0.6666 Litre/Minute. Flow rate is commonly measured using the units Litre/Minute . It is also often measured in Gallon/Minute, or Litre/Hour or Gallon/Hour. It depends how powerful the flow is . Flow rate of water out of a Reservoir can be measured in megalitres per minute. Sometimes it is measured in Cubic Feet/Minute. The choice of units is your choice but it will always involve a Volume unit and a Time unit.

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12y ago

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