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.
In: 24
Because there’s a vacuum between the inner and out walls of the mug. Vacuums are really good insulation because heat has a hard time transferring through nothing.
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