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The inner part of a thermos flask is a seamless container - usually made of glass. It is blown into a mould while the glass is molten - and formed so that there is a thin layer of space between the inside and outside walls. The air between the two layers is sucked out - creating a vacuum. Since heat cannot travel well through a vacuum, the liquid inside the flask stays hot (or cold) for a long time.

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15y ago

Insulation inhibits or slows the transfer of heat energy into or out of the container, thus maintaining the original temperature for a longer period of time.

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15y ago

Because there is a vacuum between the inner and outer walls, heat cannot easily pass through from inside to outside - or from outside to inside.

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Q: How do insulated containers maintain the temperature of the contents?
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