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Pressure diffence between water column in capillary tube and open vessel

  1. Oct 14, 2011 #1
    1. The problem statement, all variables and given/known data

    It is known that water in a capillary will rise to a certain height, as shown in the figure. Comparing the points P and Q, which point exhibit larger pressure?
    a. P
    b. Q
    c. The pressure of P and Q are the same


    2. Relevant equations
    F_upward=2*pi*R*T*cos⁡θ
    W=pi*R^2* ρgh
    as upward force is counteracted by the weight of water
    therefore the height of the column, h=(2T*cos⁡θ)/Rρg

    3. The attempt at a solution
    I think the pressure of P and Q should be same as they are at the same height, but can anyone give me an explanatory term for it?

    Should I consider the surface tension and so on for this question ??
     
  2. jcsd
  3. Oct 16, 2011 #2
    It would not hurt to have a description of points P and Q or better yet a picture.
     
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