$Assertion :$ A brass tumbler feels much colder than a wooden tray on a chilly day.
$Reason :$ The thermal conductivity of brass is more than the thermal conductivity of wood.
AIIMS 2008, Easy
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Brass is a metal and good conductor. On a cold day, when brass tumbler is touched heat transfers from our body to brass, since our body looses heat so the tumbler feels cold. On the other hand, transfer of heat from our body to wood is slow and less, hence wooden tray appears warm.
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