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^^ Well, it simply is that a thermos bottle has no air in between the contents inside it and the casing. There is a vacuum in the bottles walls. This way, without any air, no heat can be conducted. In general, items that are cold "draw" heat (usurp) away from surfaces warmer than themselves.
Warm items loose this heat to the atmosphere. With no conductive material in between them, this reaction/action is slowed.
GreyWolf, could you kindly expand further on the adage explained above because I view destruction of an item would render it's possession useless?
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