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Difference between Capillary Rise and Capillary Depression

by Saterial
Tags: capillary, depression, difference, rise
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Saterial
#1
Sep28-12, 01:35 AM
P: 52
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.
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Borek
#2
Sep28-12, 02:14 AM
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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?
Saterial
#3
Sep28-12, 05:56 AM
P: 52
I do yes, mercury has an angle greater than 90 degrees unlike other solutions. But this only applies to mercury does it not?

Borek
#4
Sep28-12, 07:25 AM
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Difference between Capillary Rise and Capillary Depression

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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