Question

Why glass is used to make a thermos flask ?​

Answer 1

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The glass is silvered (like a mirror) to reduce infrared radiation. The combination of a vacuum and the silvering greatly reduces heat transfer by convection, conduction and radiation. So why do hot things in a thermos ever cool down? You can see in the figure two paths for heat transfer.

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Answer 2

Answer:

The glass is silvered (like a mirror) to reduce infrared radiation. The combination of a vacuum and the silvering greatly reduces heat transfer by convection, conduction and radiation. So,glass is used to make a thermos flask.