Here's why:
* Water molecules are attracted to each other. This attraction is called cohesion, and it creates a strong force on the surface of the water, making it act like a thin, elastic film.
* Hair is hydrophilic. This means that the hair is attracted to water molecules.
* When you remove the brush from the water, the surface tension of the water tries to hold the hair together. The cohesive forces between the water molecules are stronger than the adhesive forces between the hair and the water. This causes the water molecules to pull the hair together, creating the clinging effect.
Think of it like this: Imagine a small rubber band wrapped around a bunch of strands of hair. When you pull the hair out of the water, the rubber band (surface tension) tries to keep the strands together.