What is a vacuum thermos?

Vacuum insulated tableware. The thermos pot is a kind of vacuum insulation tableware, which is usually made of stainless steel and has a double-layer structure. A sealed cavity is formed between the inner container and the outer layer to evacuate the vacuum, so it is a vacuum insulation tableware. Because of vacuum isolation, the temperature of food in the inner container is not easy to radiate through the outer layer, and the external temperature is not easy to affect the temperature in the inner container, thus achieving the effect of heat preservation.