The surface tension of a liquid is to be measured using a liquid film suspended on a U-shaped wire frame with an 8-cm-long movable side. If the force needed to move the wire is 0.024 N, determine the surface tension of this liquid in air.
Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible.
Surface tension of liquid is the force per unit length.σs =
In this case surface tension is is measured using a liquid film suspended on U shaped wire frame with an 8cm long movable side shown below
So the surface tension
Where L is the length of the movable side
The reason for the term is because the film has two sides
Textbook: Fluid Mechanics
Author: Yunus A. Cengel, John M. Cimbala
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