First slide

Surface tension and surface energy

Question

In the glass capillary tube, the shape of the surface of the liquid depends upon

Moderate

A

Only on the cohesive force of liquid molecules
B

Only on the adhesive force between the molecules of glass and liquid
C

Only on relative cohesive and adhesive force between the atoms
D

Neither on cohesive nor on adhesive force

Solution

The angle of contact depends upon the relative cohesive and adhesive forces between the atoms, which exists above the free surface.

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