Why does a lump of cotton wool shrink in water??
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Answer:
A lump of cotton wool has a lot of air trapped inside the space present in its fibres. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this the cotton lump shrinks down.
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Answer: Cotton wool contains a lot of air between its fibres. When it is dipped in water, water displaces air from the fibres and they ( fibres ) come closer. This makes the cotton wool shrink in water.
Explanation:
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