Do an activit to show that solid expands on heating.
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Conclusions: This proves that solids expand on heating and contract on cooling. Why do solids and liquids expand when heated? Objects expand when heated because the heat 'gives' molecules more energy, so they move around more.15-Oct-2018
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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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