The conversation between human and AI assistant.
Why is ice lighter than water?
Ah, I see. And why do some solids like diamond have higher densities than liquids?
Good question! The density of a solid is determined by the size and weight of its molecules, the spaces between them and the how tightly they're held together. Diamond is denser than most liquids because of its carbon atoms are packed tightly together in a crystal lattice structure, which leaves little empty space between the atoms. This makes diamond much heavier than most liquids.