Howstuffworks "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! Keyword: cold , conduction , dewar , heat , heat transfer , hot , how does a thermos work , insulate , insulation , thermos , vacuum flask , warm home.howstuffworks.com/thermos.htm Add Url or Add Site to Submit Site to the vacuum flask Directory |