Why should a thermos flask not be filled to the brim? - Quora

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Answer: A Thermos Flask(Vacuum Flask) is a bit like a super-insulated jug. Most versions have an inner chamber and an outer plastic or metal case separated by two layers of glass with a vacuum in between. The glass is usually lined with a reflective metal layer. Unbreakable flasks do away with th

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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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How long do drinks stay hot in a thermos? - Quora

Why has my stainless steel flask thermos bottle hydro flask stopped working?-ECOWAY HOUSEWARE

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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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Why should a thermos flask not be filled to the brim? - Quora