Solve this multiple-choice question and choose the correct option.

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Everyday physics: Why blotting paper absorbs ink. The absorption of liquid ink into blotting paper occurs due to which physical effect in porous materials? Choose the correct option.

Difficulty: Easy

Capillary action (capillarity)
Osmosis across fibers
Electrostatic attraction
Viscous drag only

Correct Answer: Capillary action (capillarity)

Explanation:

Given data

Porous paper absorbs ink spontaneously.

ConceptIn narrow pores, surface tension and adhesion create capillary rise, drawing liquid into the material.

Final AnswerCapillary action (capillarity)

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