1. Explain why a substance expands on heating.
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When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
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If a substance is heated its atoms and molecules vibrate faster and their kinetic energy increases. As the atoms vibrates faster the space between the atom increases. Due to this the atoms and molecules take up more space and causes increase in size in solids.
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