When did the thermos bottle appear? Why didn't you see a thermos bottle abroad?

The thermos bottle, also called thermos bottle, was invented by British scientist Dewar. 1900, he first changed compressed hydrogen into liquid, that is, liquid hydrogen. This kind of thing needs to be bottled, but there was no thermos like this at that time. He developed it himself. He used the vacuum method, that is, he made a double bottle, which pumped the air out of the interlayer and cut off the conduction. However, the subsequent thermal radiation will also affect the thermal insulation, so Dewar coated a layer of silver or reflective paint in the vacuum interlayer to prevent the thermal radiation from coming back. Plug the bottle with another stopper. In this way, the three ways of heat conduction are cut off, and the bottle liner can keep the temperature for a long time. He used this bottle to store liquid hydrogen. Later, it was widely used, and now almost every family has a thermos bottle, which is a thermos bottle.

In fact, foreigners also use it, but it may be fashionable, and it is all metal, not our traditional plastic shell.