Frictional loss in pipes.
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Why is this multiple-choice question about friction loss wrong?
It shouldn’t be “volume per unit of liquid”"
So what should it be? Per unit mass?
First, it’s not “liquid” but rather “fluid””； Secondly, the unit for frictional loss is not per unit volume or per unit mass; it is generally expressed as \"the amount of fluid column lost per unit length of pipe\", that is: meters of fluid column per meter of pipe length. Choose “Wrong” for the answer. As for how to correctly describe the frictional losses, that is another issue.
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The energy lost in fluid flow to overcome frictional resistance is known as friction loss