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.
Even without a vacuum, the heat would have to travel up and down the circumference of the hollow vessel wall, and metal is both a great conductor and dissipator of heat, so it likely also cools before the point where the heat meets your fingers.
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