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How is a metal thermos made?
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Explain the design of a thermos flask.
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How does a vacuum flask work?
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Vacuum insulated bottle how it works?
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My thermos flask worked fine for a few months until it suddenly stopped keeping the heat in entirely. How do vacuum flasks stop working? - Quora
Draw a labelled diagram of a thermos flask Describe its working
Inner Workings of a Thermos - How Thermoses (Vacuum Flasks) Work | HowStuffWorks
