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Feb25-12, 06:19 AM
Sci Advisor
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tiny-tim's Avatar
P: 26,148
hi raymond350! welcome to pf!

if it's capped at the end, why should there be any pressure loss?

if the water supply is from a constant-head tank, then the pressure will stay the same

if it's from a tank that isn't being refilled, then the loss of pressure will depend on the horizontal area of the tank the faster the water goes down, the greater the loss in pressure