How do thermoses keep coffee hot?
Chemistry For Your Life
00:00
Vacuum Flasks
When I think about something heating up, I have a mental picture in my mind of molecules moving more. The movement of the molecules is almost what's transferring the heat. As the molecules move, the kinetic energy is going to bounce out as well as the temperature. So if you put something with a lot of kinetic energy that's all hot and moving around, like a cup of coffee, that's not insulated, you put it down in over time as it comes into contact with the outside surroundings, the temperature will even out. And the temperature of that thing will stay roughly the same as the temperature of the room. Okay. Why doesn't that happen in vacuum flasks? Is it because
Transcript
Play full episode
