Blotting paper is made of porous material containing many tiny spaces. When ink touches the paper, the liquid rises into these narrow spaces due to the adhesive forces between the ink and the paper fibers being stronger than the cohesive forces within the ink, a phenomenon known as capillary action.
The absorption of ink by blotting paper involves
Asked in WBPSC CS Prelims 2020 · Topic: Physical Properties of Materials (Viscosity and Surface Tension)
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