How Thermoses (Vacuum Flasks) Work

How can the same device keep hot things hot and cold things cold? Find out what goes on inside a Thermos!

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Milton Thermosteel Flip Lid 1000, Double Walled Vacuum Insulated Thermos 1000 ml | 34 oz | 1 Ltr | 24 Hours Hot and Cold Water Bottle with Cover

How is a metal thermos made?

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Would the vacuum flask work as well in keeping its content hot if its inner vessel cracked? - Quora

Joyoung Vacuum Flasks Thermos Portable With Handle Insulated Water Bottle For Work Hike Camping Trip SUS316 Stainless Steel - AliExpress

Work is Never Done Thermos - All American Roughneck

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HOTS Questions, Heat