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Everything conducts heat, but a hot water bottle is designed to insulate, not conduct, so it doesn't lose heat too quickly and end up a cold water bottle.

It does this by using water, which has a high heat capacity (a lot of energy must transmitted to cool it down), plastic, which is an insulator, and a furry coating, which traps still air, which prevents heat loss via convection.

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Zackery Schumm

Lvl 13
3y ago

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