Vacuum Flask

- Dec 04, 2019-

The vacuum flask was invented by the scientist dewar in England. Another layer of silver or reflective paint is applied to the vacuum compartment to keep the heat radiation out. Plug the bottle with another stopper. All three modes of heat conduction are thus cut off, and the tank remains warm for a long time. He used this bottle to store liquid hydrogen. Has been widely used, almost every family has a thermos, or thermos bottle.