### Flow Rate Calculator - calculate the flow rate of a pipe

If we further know that the density of water is 1000 kg/m 3 we can calculate the mass flow rate to be 17.6715 m 3 /h 1000 kg/m 3 = 17671.5 kg/h (= 17.6715 tonnes per hour, m 3 cancels out). Example 2: A rectangular pipe has a height of 2cm and width of 4cm and a gas running through it at a speed of 15 m/s.

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