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A copper tumbler feels much colder than ...

A copper tumbler feels much colder than a wooden block on a cold day. Explain why.

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Copper is a good conductor of heat, whereas a wood is a bad conductor of heat. When copper tumbler is touched, the heat will flow from our body which is at higher temperature than the copper tumbler and hence we feel cold. In case of wooden tray, no heat is transferred from our body to the tray and hence we do not feel cold.
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