Take a small cotton ball and place it in a tumbler/ bowl filled with water. Observed it for at least 10 minutes. Will it float or sink in water and why?

i. The cotton ball is lighter than water.

ii. First, when it is placed in water, it starts to float on the surface.

iii. But after 10 mins, it absorbs water. As a result, it becomes heavier than water.

iv. Thus, it will sink in water after 10 mins.