Answers

2015-04-02T18:47:46+05:30
Cotton (and wool, silk, etc.) swell up when they come in contact with water because they absorb water. They subsequently shrink when the water is removed from them.
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2015-04-02T20:43:11+05:30
A lump of cotton wool will shrink in water because it observe large amount of water than any other fibers as well as wool takes more time to get dried up.
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