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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That depends on what you mean by thin walled. A soda can usually have less then 0.1mm thick walls. But in order to make the walls rigid and durable you would have to make the walls at least 0.5mm thick. This is the advantage of using metals as you can make very strong thin structures. But most travel mugs are double walled. And if we take two of these 0.5mm thick metal walls and space them 5mm apart we get a total thickness of 6mm. That is about the same thickness as a thin ceramic mug. But there is 5mm of insulation in the form of vacuum or a thin gas.
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