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Difference between Capillary Rise and Capillary Depression

  1. Sep 28, 2012 #1
    As the title states, can anyone help me understand what the difference between the two is? I've been trying to look everywhere but nothing really explains why they're different. I just thought it would be the same.

    This is based on the capillary rise method for surface tension.
     
  2. jcsd
  3. Sep 28, 2012 #2

    Borek

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    Staff: Mentor

    Do you know what the wetting angle is and how it depends on the interactions between liquid, surrounding gas and capillary walls?
     
  4. Sep 28, 2012 #3
    I do yes, mercury has an angle greater than 90 degrees unlike other solutions. But this only applies to mercury does it not?
     
  5. Sep 28, 2012 #4

    Borek

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    Staff: Mentor

    No, it applies to all liquids on all surfaces. Depending on which interactions are stronger liquid either "prefers" to sit as a spherical droplet or to spread away on the surface - in both cases it tries to find the minimum energy form. Physical/mathematical description is always the same.
     
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