A drop of ink spreads on a blotting paper
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Blotting paper has a large number of pores (tiny holes) on its surface. Each pore acts as 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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The blotting paper is a thin and smooth paper which grants an infant thicker liquid like ink to absorb, so it involves capillary action. That is required for liquids flow that means to dissolve things.
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