why do we use vacuum flask to keep hot water or tea for a longer time?
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The vacuum prevents conduction. The tight stopper prevents air from entering or leaving the flask, so convection isn't possible either. ... There's virtually no way heat can escape from a vacuum flask and a hot drink stored inside will stay steaming hot for several hours. Flasks also work for cold drinks
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The vacuum prevents conduction. The tight stopper prevents air from entering or leaving the flask, so convection isn't possible either. ... There's virtually no way heat can escape from a vacuum flask and a hot drink stored inside will stay steaming hot for several hours.
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