The principle of stainless steel thermos is based on the following principles: preventing heat transfer; Several ways of heat transfer: 1, conduction; 2. radiation; 3. Convection; In fact, the structure of stainless steel thermos is very close to that of glass thermos, but the material is changed to stainless steel. First of all, there are two layers, an ordinary outer layer and an ordinary inner container. The outer layer and the inner container are connected to a short section of the bottle mouth, and with a well-sealed cover, the heat conduction and convection paths are small. At the same time, the smooth surface also cuts off the radiation path. This is the principle of stainless steel thermos.