Home › Forums › Chemistry › Why does a lump of cotton wool shrink in water › Reply To: Why does a lump of cotton wool shrink in water May 19, 2023 at 6:50 pm #24033 ProtonsTalkKeymasterUp2Down::A lump of cotton wool had a lot of air trapped inside it. It shrinks in water as the water gets into the lump and pushes out the air.
