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In order for the flow analogy between the fluid and electric currents toThis brings to mind a visit to Guy's Hospital.
be in a closer correspondence we should not assume that the pipe is
unobstructed. Rather we should think of the pipe as being loosely filled
with a fixed permeable wadding or stuffing that creates friction with the
moving fluid throughout the pipe's interior. This will tend to cause the
pipe's resistance to be proportional to L/A. ....
David Bowman
dbowman@georgetowncollege.edu