FEW laboratory devices have achieved the popularity of the vacuum flask. Since Sir James Dewar designed it for the purpose of preventing his liquid air from rapid evaporation, the flask has become ...

Dewar was interested in cryogenics, the science of extreme cold and ... the space between the two walls, creating a vacuum. Liquid put inside the flask stays at the same temperature because ...

I would venture a guess that many people in the United States have more than one thermos in a cabinet that boasts about its ...