The thermos is a special vessel with a very low heat transfer coefficient. It consists of a flask made of glass composition. Outside and inside, it is covered with a special layer to reflect heat radiation. And also the flask can be made in the form of a container with double walls, between which air is pumped out. That is, a vacuum is created, and as you know, the vacuum does not conduct heat. And from the outside, the flask is closed with a thin metal casing. The thermos is made with low heat transfer, so ice can be stored in it.
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