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How Thermoses (Vacuum Flasks) Work

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Description: For inquisitive people howstuffworks.com tells about how thermoses work. You can find there other vacuum-based devices as vacuum cleaner and television.
HowStuffWorks "How Thermoses (Vacuum Flasks) Work" How Thermoses (Vacuum Flasks) Work Introduction to How Thermoses (Vacuum Flasks) Work Most people have or are familiar with the "Thermos" (also known as a vacuum flask or a dewar). I can remember as a kid having one that came with my lunch box. One day my mother might put grape juice in it and at lunch I would have nice, cold grape juice. The next day she would put hot soup in it and I would have hot soup for lunch. And I can remember asking, "How does it know whether to keep stuff hot or cold?" Where's the switch, in other words...
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Page title:HowStuffWorks "How Thermoses (Vacuum Flasks) Work"
Keywords:how does a thermos work, thermos, vacuum flask, dewar, hot, heat, cold, insulate, insulation, heat transfer, warm, conduction, convection, radiation, information, tutorials, explanation, explains, understand, understanding, tell me, students, teachers, study, educational, learns, learning, resources, k12, k-12, help, helpful
Description: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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