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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
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Describe the construction of a thermo flask with the help of a neat diagram and label it.
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Explain the working of thermos flask. - Science | Shaalaa.com
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How is a thermos flask able to keep a liquid cold for a long time? - Quora
