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How does a thermos flask stainless steel is hot?

I was mostly just wondering, dtailed answers are appreciated. But As always, all answers are appreciated. Once I had hot water in a flask in stainless steel thermos and later she was still hot 2 days, I wondered why.

because it is a vacuum flask, you have two bottles stainless steel welded with only between a vacuum, a vacuum is very poor conductor of heat, so it's a very good insulator http://home.howstuffworks.com/thermos2.htm

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