Why does a lump of cotton wool shrink in water? 



There is a lot of air trapped inside the lump of cotton wool. Therefore, when we add it in water , the air trapped is released and is replaced by water and the cotton lump shrinks.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo