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A shaving brush is dipped in water. When taken out, the hairs of the brush are seen to be drawn together due to
1. surface tension of water
2. viscosity of water
3. elasticity of the hairs of the brush
4. temperature difference between air and water

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Correct Answer - Option 1 : surface tension of water

The correct answer is the surface tension of water.

  • A shaving brush is dipped in water, when taken out the hairs of the brush are seen to be drawn together due to surface tension.
    • This happens because the free surface of water tries to acquire a minimum surface area.
  • Surface tension is the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.
  • Newton Per Meter (N/m) is a unit in the category of Surface tension.

  • The viscosity of water is 1.0016 millipascals⋅second at 20 °C.
    • That is for its dynamic viscosity.
    • Water viscosity varies depending on its temperature, and the higher the temperature is, the less viscous water is.
    • At a molecular level, viscosity is a result of the interaction between the different molecules in a fluid.

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