Which coffee cup makes the coffee the warmest?

Answer 1

I am speaking from experience here...

When camping, I find a tin (aluminum/aluminium) or pewter cup to make the coffee cool down too quickly because of their good heat absorption. Ceramic cups are good for keeping coffee hot because they don't absorb heat as much. This is why some Formula 1 cars have ceramic engine parts. The same with plastic, Tupperware, melamine, stone and clay.

I find that a good, solid glass cup or mug keeps coffee hot for quite a lot longer than any other, especially if you can find something to cover the top and not let the steam escape. I don't mean toughened glass, that's just super Perspex, I mean real sand molten glass.

I have used a glass plunger to make espresso that has a chrome lid, a small spout for pouring that a little steam gets out from and can stay quite hot for over an hour. It holds about 3 regular cups of coffee.