By multiplying it by the density of the substance (expressed in tonne/m3) that occupies the volume of 1000m3.
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Divide by 1000
1 tr = 2.4 usgpm
16.296580848222166199582873226181293151844 tons
multiply 160 tons x 2000 lbs/ton. So we have 160x2000=320000 pounds
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