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Why does a solid change to a liquid when heat is added

User Angel
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2 Answers

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When heat is added it is adding more energy to the solid. The molecules in the solid start to vibrate faster and are able to move around, which means the solid is melting to form a liquid.
User TehTris
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3 votes
Particles will have more energy and will vibrate really fast.

(Hope this helps)
User Gas
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