Sept. 23, 2019

Surface Energy:

The potential energy of surface molecules per unit area of the surface is called surface energy.

Unit : Joule/m2 (S. I) erg/cm2 (C. G. S)

Dimension [MT-2]

If T is the force due to surface tension per unit length, then F = T x 2/

W = F x = (T 2I)  x = T (2Ix) = T ∆A 

W = T ∆A [∆A = Total increase in area of the film] 

If temperature of the film remains constant in this process, this work done is stored in the film as its surface energy. 


From the above expression T = W∆A or T = W  [If  ∆A = 1]