Re: Jorge Cham's graphical illustration
But it IS in a thermos flask -- a thermos flask's insulation layer is vacuum. Your tea is kept piping hot by wrapping a layer of outer space around it.
That's why I'm so impressed by the 32C external rear temp. I'd assumed some sort of heat-pump for the innards, but the outside is the vacuum interface and is stuck with radiation as the only heat-shedder. And _still_ only 5C hotter than the inside.
Biting the hand that feeds IT
