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Like all molecules, a molecule of H20 is in constant motion; 'hot' molecules move faster than 'cold' molecules. If the molecules move slowly enough the substance appears stationary to us (frozen water) and if they move quickly enough they will expand to fill their container (vapor or gas water.)

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13y ago
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4y ago

They begin to move faster.

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4y ago

They begin to move faster

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Q: What happens to water molecules when they are heated?
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