Contact angle of liquid drop on solid surface.

  1. 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/EAMCET/QR/Physics/Jr Phy/12Surface tension _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.
     
  2. jcsd
  3. direction will be tangential to both interfaces.
     
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