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A shaving brush is dipped in water. When taken out, the hairs of the brush are seen to be drawn tightly together due to the:

  1. A
    surface tension of water
  2. B
    viscosity of water
  3. C
    elasticity of the hairs of the brush
  4. D
    temperature difference between air and water

Solution & Step-by-step Explanation

When a shaving brush is fully immersed in water, the liquid exerts equal force from all sides, causing the individual hairs to remain spread out. However, when the brush is pulled out of the water, a thin film of water clings to the brush hairs. Due to surface tension, the liquid surface naturally contracts to minimize its surface area, drawing the fine hairs of the brush tightly together.

Practice this question

Try it yourself before checking the explanation above.

A shaving brush is dipped in water. When taken out, the hairs of the brush are seen to be drawn tightly together due to the:
A
surface tension of water
B
viscosity of water
C
elasticity of the hairs of the brush
D
temperature difference between air and water

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MechanicsProperties of MatterSurface Tension

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