why does a lump of cotton wool shrinks in water
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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.
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Cotton wool remains fluffy because of air trapped in it. When the cotton is dipped in water, the water fills up the spaces occupied by the air in the cotton and the air escapes. Therefore the cotton ball shrink when dipped in water.
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