Why do things expand on heating ?
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Atoms move, and that is called kinetic energy, and when you will heat an object, it's kinetic energy increases and molecules go far from each other.
Please if you have to write it as definition kindly check it again and post question again so that anybody will answer the correct one I have just given you an idea for it.
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Explanation:
When heat is added to some substance the molecule and atoms of that substance start vibrating.As they start vibrating the space between particles increases.
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