Question

why does a lump
of cotton wool shrink in water​

Answer 1

Answer:

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. ... Thus, both plants and animals help each other in the exchange of gases in the atmosphere.

Explanation:

hope it was relevant for you .

Answer 2

A lump of cotton wool shrink in water because -

• In the normal dry state,the cotton wool is fluffy and has more surface area due to the air bubbles trapped inside the small compartments of the wool's physical structure.

• Now,when we dip the cotton wool into the water,the air in the air filled compartments gets replaced with the water.

• This replaced water collapse the void space of these compartments and the allover volume of the cotton wool decreases than the initial stage.