MadSci Network: Physics |
Aluminum foil is a good conductor of heat energy, so how does wrapping up a hot potato in foil keep it hot? For example, you can put an aluminum nail in the potato to speed up cooking, but the same material seems to retain heat when used as a wrap. I suspect that the foil keeps water (steam) from escaping, but why doesn't the potato cool down just as fast as an unwrapped potato due to heat escaping directly through the foil?
Re: Why does aluminum foil keep a hot potato hot?
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