Question

Why does a lump of cotton wool shrink in water ?
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Answer 1

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Cotton wool remains fluffy because of air trapped in it. When a lump of cotton wool is dipped in water, the air goes out of the lump. Due to this, the cotton wool shrinks when dipped in water.

Answer 2

Answer:

The answer lies in that when a cotton wool is fluffy air is trapped in it and when it is soaked in water air goes out and water comes in thus changing its size and shrinking it..