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Turning the water on at one end of the 20 meter pipe caused water to come
out of the end practically at the same instant, though clearly the flow of
water takes much longer.
I wonder if I can say that some energy has flowed along the pipe
I assume at the speed of sound in the water.
Here is a circumstance where there are 2 distinct 'flows'. Am I correct in
calling both 'flows'?