Difference between Capillary Rise and Capillary Depression

  • Thread starter Saterial
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  • #1
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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.
 

Answers and Replies

  • #2
Borek
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Do you know what the wetting angle is and how it depends on the interactions between liquid, surrounding gas and capillary walls?
 
  • #3
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I do yes, mercury has an angle greater than 90 degrees unlike other solutions. But this only applies to mercury does it not?
 
  • #4
Borek
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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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