Introduction of thermos cup

A thermos cup is simply a cup that can keep warm. Generally, it is a water container made of ceramic or stainless steel and a vacuum layer. The top is covered and sealed tightly. The vacuum insulation layer can delay the heat dissipation of the liquid such as water inside, so as to achieve the purpose of keeping warm. A thermos cup is developed from a thermos bottle, and its heat preservation principle is the same as that of a thermos bottle, except that people make the bottle into a cup for convenience.

Introduction to insulated lunch box

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