Contact angle of liquid drop on solid surface.

In summary, the contact angle of a liquid drop on a solid surface is a measure of the wettability of the surface and can provide information about its surface energy and chemistry. It is typically measured using a goniometer and can be affected by factors such as surface roughness, chemistry, and energy, as well as properties of the liquid. The contact angle can change over time due to various factors and has practical applications in fields such as coatings, adhesives, and microfluidics.
  • #1
amk_dbz
42
0
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.
 
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  • #2
direction will be tangential to both interfaces.
 

1. What is the significance of the contact angle of a liquid drop on a solid surface?

The contact angle of a liquid drop on a solid surface is a measure of the wettability of the surface. It tells us how easily the liquid spreads or beads up on the surface, which can provide information about the surface's surface energy and surface chemistry.

2. How is the contact angle measured?

The contact angle is typically measured using an instrument called a goniometer, which uses a camera and software to measure the angle formed between the liquid drop and the solid surface.

3. What factors can affect the contact angle?

The contact angle can be affected by several factors such as the surface roughness, surface chemistry, and surface energy of the solid surface, as well as the properties of the liquid, such as its surface tension and viscosity.

4. Can the contact angle change over time?

Yes, the contact angle can change over time due to factors such as evaporation of the liquid or changes in the surface properties of the solid. It can also change due to external factors such as temperature and pressure.

5. What are some practical applications of studying the contact angle of a liquid drop on a solid surface?

Studying the contact angle can have various practical applications, such as in the development of coatings, adhesives, and other surface treatments. It can also be used in fields such as microfluidics, where precise control of liquid flow on solid surfaces is crucial.

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