How does liquid remain hot or cold for a long time in a thermos flask because there is no loss or gain of heat? - Quora
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Thermos 24 oz. Matte Red Stainless Steel King Vacuum-Insulated Water Bottle SK4000MR4 - The Home Depot
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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Amazon.com: THERMOS FBB500SS4 Vacuum Insulated 16 Ounce Compact Stainless Steel Beverage Bottle: Home & Kitchen
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