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Pretty much any small covalent molecule can exist as a solid, liquid, or gas, so there's not really much of a "why" involved. If it couldn't exist in all three phases, why NOT would be a MUCH more interesting question.

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14y ago
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14y ago

because moleculec bounce around more when it's warmer therefore they expand. and if you stretch them enough - they change from solid to water and from water to gas.

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Q: Do scientists know why water can be solid liquid or gas?
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