The thermos, also called the thermos, was invented by the English scientist Dewar. In 1900, for the first time, he turned compressed hydrogen into a liquid, liquid hydrogen. This kind of thing has to be packed in bottles, but there is no such thermos at the time. He developed it himself. He uses a vacuum method to make a double-layered bottle, which removes the air in the compartment and cuts off the conduction. However, after this heat radiation will also affect the insulation, so Dewar applied a layer of silver or reflective paint in the vacuum compartment to block the heat radiation. Then use a stopper to block the bottle mouth. In this way, the three methods of heat conduction are cut off, and the bottle liner can maintain the temperature for a long time. He used this bottle to store liquid hydrogen. Later, it was widely used, and almost every one has a thermos bottle or a thermos. As shown in the figure, the circuit diagram of Warburg DYP22A DYP30A electronic thermos. Ac Magnetic Contactor,Ac Electrical Contactor,Ac Series Contactor,Ac Contactor For Switching Capacitor NanJing QUANNING electric Co.,Ltd , https://www.quanningtrading.com