Why is there air space in a thermos bottle? - Quora
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How is a metal thermos made?
1. The thermos bottle in the figure below has two insulators-the glass layers and the vacuum. The is the better thermal insulator. 2. A material that conducts thermal energy well is
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What makes glass the only material that is used in thermo flasks? - Quora
How Does a Thermos Work? | Wonderopolis
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