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How does a thermos flask keeps a hot liquid hot and a cold liquid cold?

April 26, 2017cold flask hot liquid

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How does a thermos flask keeps a hot liquid hot and a cold liquid cold?

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The idea here (with the thermos) is to slow down the movement of heat from one place to the other. So if you have hot stuff in the thermos or cold stuff in the thermos, the end result is the same. Keep heat from moving to where you don’t want it to go for as long as possible.