Dewar was interested in cryogenics ... Eventually he designed a double-walled glass flask and removed the air from the space between the two walls, creating a vacuum. Liquid put inside the ...

In 1892, Dewar came up with the idea of placing one flask within another, separating the two by a near vacuum. That vacuum ...

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 ...