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Metals have higher thermal capacity than plastics
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Plastics have a lower density than metals
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Metals are good conductors of heat
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Plastics have a higher thermal conductivity than metals
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On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because metals are good conductors of heat.
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