My wife recently got me a new travel coffee mug and it’s the best one I have ever had as far as keeping the coffee really really hot for a long time. It is very thin walled and I just don’t understand how the heat does not transfer to the outside surface of the cup.
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It’s probably a thermos. The mug is made of two layers of aluminum with a gap between them. In high quality thermoses, this gap is vacumed out but either way this gap is extremely difficult for heat to cross. You’ll still get heat loss from the rim and cap but it’s very slow, keeping your coffee hot longer.
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