Piggybacking off of a recent question asking whether drinking cold water means drinking the most water.
In: Physics
When water is liquid, it’s molecules are all nice and snug, relatively.
When most substances freeze, their molecules just get even closer together.
But because of specific properties of water molecules (their shape and polar nature), instead of getting closer, they arrange themselves into a sponge-like structure, with voids in-between. This is what makes ice less dense AND why it expands.
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