- #1
Logic hunter
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Consider a fixed horizontal tube of uniform cross section with pressure being 1atm at one of it's end and 5atm at the other (former due to 'open to atmosphere' and latter due to force on a piston), then liquid would flow towards low pressure end. By equation of continuity all cross sections will have same velocity. Since tube is horizontal all of them will have the same potential energy. So by bernoulli's theorem all of them should have same pressure, but the pressure at both the ends of the tube are different for liquid to flow. Also is this apparent 'contradiction' only true for the cross sections at the end and pressure is same for all other cross sections or is the pressure gradually decreasing on moving from one end of the tube to the other (towards the low pressure end).