Eli5: Why can a thermal flask keep items cold for 24 hours, but only hot for 12 hours.
In: Physics
Randall Munroe’s answer on his What If? blog to “Would a toaster still work in a freezer?” is a good read, and has some relevant info: [https://what-if.xkcd.com/155/](https://what-if.xkcd.com/155/)
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