Question

Define surface tension give its units.Show that surface tension is equal to surface energy

Answer 1

The liquid molecules which are below the surface are in equilibrium.  The liquid molecules which are at the surface are attracted by other molecules in downward direction. So, a force is originated to balance the surface molecules which is equal but opposite in direction to the downward force. This force is called surface tension.

Answer 2

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Here is your answer

Surface tension is defined as the force acting per unit length perpendicular to the line drawn on the surface of the liquid

Unit : NM^-1 or KgS-2