First slide

Surface tension and surface energy

Question

The potential energy of a molecule on the surface of liquid compared to one inside the liquid is

Moderate

A

Zero
B

Smaller
C

The same
D

Greater

Solution

When the surface area of the liquid is increased molecules from the interior of the liquid rise to surface . As these molecules reach the surface work is done against the cohesive force.This work is stored in the molecules in the form of potential energy .Thus , the potential energy of the molecules lying in the surface is greater than that of the molecules in the interior of the liquid.

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