All three states of matter (solid, liquid and gas) expand when heated.
Explanation: The atoms themselves do not expand, but the volume they take up does. When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small.
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Answer:
All three states of matter (solid, liquid and gas) expand when heated.
Explanation:
The atoms themselves do not expand, but the volume they take up does. When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small.