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Work done in capillary action

  1. Apr 14, 2012 #1
    This question struck me when i was watching a liquid rise in a capillary tube. I'm curious to know from where the energy gets transferred to the liquid to rise above the surface. Well, one possible explanation that i can think of is air pressure. Though, it can be a possible reason only if the other end is closed (i don't remember if it was open or closed). So am i on the right track?
     
  2. jcsd
  3. Apr 14, 2012 #2

    tiny-tim

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    Hi AudioFlux! :smile:
    No, it's surface tension, see …

    http://en.wikipedia.org/wiki/Capillary_action#Height_of_a_meniscus
    http://en.wikipedia.org/wiki/Wetting
    http://en.wikipedia.org/wiki/Contact_angle :wink:

    (if the contact angle is greater than 90°, the solid surface is hydrophobic, and the liquid will fall

    this is how those damp-proofing injections work, they line the capillaries in the bricks with a hydrophobic lining)
     
    Last edited: Apr 14, 2012
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