Asked by zainab Ibrahim

why does the bristles of a brush spreads when the brush is in water and cling together when it is taken out from the water?
Answered by Bot
This phenomenon is due to surface tension. When the brush is in water, the water molecules at the surface of the water create a cohesive force that causes the water to pull together, creating surface tension. This tension pulls the bristles apart, allowing them to spread out. As the brush is taken out from the water, the surface tension decreases and the force pulling the bristles apart is reduced. As a result, the bristles cling together due to their natural cohesion.