how does an thermos flask work
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it has a slivered wall for that the air should not come out
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Because heat cannot travel through a vacuum, a vacuum flask, or thermos, keeps hot things hot or cold things cold. A vacuum flask, or thermos, does not allow heat transfer by any of the three ways that heat can travel. ... The thinness of the glass walls stops heat entering or leaving the flask by conduction.
A thermoflask is painted with silver
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