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4 votes
Why does a substance change states?

User Ayushi Jha
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2 Answers

5 votes
A substance changes states because, the molecules in a object has to spread out and move quickly when it's warmer and moves slower if the subtance is getting colder.
User Wudizhuo
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4 votes
Because the molecules in an object either expand when warm or contract if its cold
User Wondering
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