About the concept of the vacuum flask is simple: bottle lining and the outer wall; Between the two walls in vacuum state, empty inside (even without air).
The middle vacuum thermos, as far as possible to prevent the occurrence of air convection; And kettle inside a silver plated, can reflect heat radiation to the bottle and not go out
Search heat to pass through a vacuum, so those who pour into the bottle of liquid can be in quite a long time, keep it original temperature. The thermos bottle stopper is made of cork and cork not easy heat conduction, as far as possible to prevent the onset of conduction;
