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How does a vacuum bottle keep liquids hot?
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Inside a vacuum bottle are two glass bottles, one inside the other. They are sealed together at the top. The air between the two bottles is removed to form a vacuum. This helps to stop the heat escaping. The insides of the bottles are painted silver. This reflects the heat from the liquid inside the flask.
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Book:
Best Ever Q&A
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Section:
Science & Technology
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Chapter:
Everyday Science
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