Home » Ask Physics » How is the surface tension direction found out?

How is the surface tension direction found out?

Can you, sir, explain point 44 of the attached image on surface tension.

Here’s the link in case attachment doesn’t work:
http://www.sakshieducation.com/EAMCET/QR/Physics/Jr%20Phy/12Surface%20tension%20_198-208_.pdf

How is the surface tension direction found out?
{i know it tangential but in which direction along the tangent?}
Also why is surface tension for Solid-Air Surface considered when balancing forces on liquid?

Surface-tension-12345

 

Asked Abhi

Answer: Surface tension acts tangential to the surface of a liquid. If we imagine a line on the free surface of a liquid, the force of surface tension acts perpendicular to this line and tangential to the surface.

At a solid liquid interface the forces of cohesion and adhesion come to play.

In the diagram, T does not necessarily represent Surface Tension. Please remember that surface tension is the property of a liquid at surface.

Here T2 and T3 stand for the force at the point of contact along the solid surface. Further discussions are welcomed.

 

Ask a Doubt

Post your Physics Doubts here

Name (required)

Email (required)

Subject

Message/Doubt/Question

Upload a file if required

Archives

askphysics@Twitter

%d bloggers like this: