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Contact angle of liquid drop on solid surface.

 
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Jan27-13, 06:13 AM   #1
 

Contact angle of liquid drop on solid surface.


Can anyone explain point 44 of the attached pdf document on surface tension.

(Here's the link in case attachment doesn't work:
http://www.sakshieducation.com/EAMCE...0_198-208_.pdf)

How is the surface tension direction found out?
Also why is surface tension for Solid-Air Surface considered when balancing forces on liquid?
Any help will be appreciated
Thank you.
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Jan27-13, 07:06 AM   #2
 
direction will be tangential to both interfaces.
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