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What is the advantage of designing a thermos so that it has a vacuum layer surrounding the area where hot liquids are started??
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What is the advantage of designing a thermos so that it has a vacuum layer surrounding the area where hot liquids are started??

What is the advantage of designing a thermos so that it has a vacuum layer surrounding-example-1
User Andrew Haynes
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To keep the heat of the liquid from dispersing into the air around the cup.
User Berkowitz
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