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Amar_6193

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I'm conducting an experiment to calculate the mass flow rate of water. Bellow is a copy of the procedure:

1) Weigh the mass in kg of a container

2) Connect a flow meter to a tap (any source) with a pipe and insure the departure pipe goes into a sink

3) Open the tap an increase flow rate till first reading on flow meter is achieved (lets say 3 litres per minute)

4) Simultaneously divert the water exiting the flow meter into the container and start the stop watch

5) Continue till time x (40.54s random time)

6) Stop the stopwatch and divert the water back into the sink

7) Re-weigh the container to obtain the mass of the water

Now just to clarify, I wish to find out the mass flow rate in calculations so that I can verify that the flow meter is giving the correct reading and correctly calibrated.

Initially I presumed that it was quite simple to figure out, by just dividing the total mass of the water by the time taken to fill up the container I would obtain the mass flow rate. However others are telling me I have to involve temperature into the equation as this changes the density. I'm still confused to why this would matter, any help would be greatly appreciated.