Question

What happens to water when it is heated from 0 °C to 4 °C?

It freezes.
It expands.
Its density increases.
Its composition changes.

Answer 1

I think it is " Its density increases."

Answer 2

@vocaloid

Answer 3

Your intuition is correct. *most* substances become less dense when heated but water is a special case that becomes *more* dense as it approaches 4 degrees Celsius as the hydrogen bonding maximizes the attraction between water molecules.

The density increases.