Explain why a vacuum flask can keep drinks cold as well as hot and suggest why the vacuum flask is commonly called the thermos flask?
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Vacuum flask is commonly called thermos flask because vacuum prevents conduction same with thermos flask. The tight stopper prevents air from entering or leaving the flask so there is a no chance of convention.
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Vaccuum flask or thermos can keep cold and hot drinks,as it has a strong layer of iron inside.
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