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What Evidence Do We Have That The Solid Form Of Water Is Less Dense Than The Liquid Form Of Water At Its Freezing Melting Point? [Solved]

Evidence that the solid form of water is less dense than the liquid form of water at it’s freezing/melting point is that solid water, or ice, will float on liquid water. Thus, the solid form of water must be less dense than the liquid form of water.

Why does ice float in water? - George Zaidan and Charles Morton

Water

Does Water Really Boil in a Vacuum Chamber? And Why?

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STATE CHANGES

On Earth, materials exist in one of three main states of matter: