3. ELI5: Why do insulated bottles hold cold for 2-3x as long as heat?

ELI5: Why do insulated bottles hold cold for 2-3x as long as heat?

Insulation works by being anti-convection.

Convection works because hot air rises and cold air falls.

Say you have a cold drink. The heat from the air touching the cup gives its heat to the liquid in the cup which causes the air to become cold and fall away. The cold air is replaced by warmer air in the room. Repeat.

With insulation (cup, house, etc) The air in the gap between the liquid and the room is cooled and held. It doesn't get replaced. So, the air outside of this behaves the same but that extra layer of cold air in the gap slows the whole process down.

Vacuum insulation works even better because there is no air touching at all. With that, the only heat trasfer is not by touch but by radiant heat only.

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