why does metal feel colder than everything else at room temperature but hotter than everything else when under sun?
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Metal is an excellent conductor of heat. So if it is very hot, it is very good at transferring its heat to you. Conversely, it is very good at accepting heat from you if it is cold.
Sometimes metal does not *hold* it’s heat very well, so that effect is temporary. It does not take long for a cold necklace to warm up to body temperature. That is a different concept. That is heat capacity instead of heat conductance. But that very first touch of a gold necklace will feel very cold.
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