First slide

Surface tension and surface energy

Question

Hairs of shaving brush cling together when it is removed from water due to

Moderate

A

Force of attraction between hair
B

Surface tension
C

Viscosity of water
D

Characteristic property of hairs

Solution

When the brush is taken out of water, the hairs cling together due to surface tension. This happens because the free surface of water tries to acquire a minimum surface area.

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