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Choose a Page:What is inside an atom?*What happens when molecules are he...*How are atoms split?What is a molecule?How can we use the energy from atoms?What types of radiation are there? What happens when molecules are heated? If a solid object is heated, its molecules vibrate strongly. If it gets hot enough, the solid melts into a liquid. Greater heat makes the liquid turn into gas.   Previous: Back Book: Best Ever Q&A Section: Science & Technology Chapter: Atoms & Molecules