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The absorption of ink by blotting paper involves
1. viscosity of ink
2. capillary action
3. diffusion of ink through the blotting
4. siphon action

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Correct Answer - Option 2 : capillary action

The correct answer is capillary action.

  • The absorption of ink by blotting paper involves a capillary action phenomenon because the blotting paper is a thin and smooth paper that allows a little thicker liquids like ink to absorb.
  •  Blotting paper absorbs ink by the process of capillary action.
    • The capillary action is based on the property of surface tension of a liquid.
    • All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.
    • Blotting paper has a large number of pores (tiny holes) on its surface.
    • Each pore acts like a capillary tube. When a drop of ink is placed on a blotting paper, it spreads on the paper due to capillary action.

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