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Explanation for Capillary Force

  1. Apr 8, 2014 #1
    1. The problem statement, all variables and given/known data
    Could some one help me understand capillary Force?


    2. Relevant equations



    3. The attempt at a solution

    If we use a capillary tube sticking in a water cup as an example. The phenomenon will be water level is higher in the capillary tube than that in the water cup.
    I understand that it is the surface tension force b/t tube and water which balances with the self-weight of the part of the water in the tube above the surrounding water level. But I just don't know why water would go up in the first place?

    So just to make the question clear, I understand why water is able to stay in a higher level in the tube, but I don't know why it goes there.

    Thanks for the help!
     

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    Last edited: Apr 8, 2014
  2. jcsd
  3. Apr 8, 2014 #2

    Simon Bridge

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