Vacuum flask
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A vacuum flask is an insulating storage vessel that slows the speed at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the
The typical design of a Thermos brand vacuum flask, used for maintaining the temperature of fluids such as coffee
Bakelite Thermos flask in the collection of the Museum of Industry (Ghent, Belgium)
1930s "Thermofix" vacuum flask
A low, wide opening design
James Dewar
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Sir James Dewar was a Scottish chemist and physicist. He is best known for his invention of the vacuum flask, which he used in conjunction for his research into the liquefaction of gases. He also stud
Vacuum flask
…lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible. Invented by James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially…
James Dewar
Dewar's vacuum flask in the museum of the Royal Institution
Sir James Dewar's ashes at Golders Green Crematorium
Portrait of Dewar by René le Brun, Comte de L'Hôpital, in the collection of the Royal Society of Chemistry