Development History of Vacuum Flask

Early Thermos Flasks
A double-walled container ever excavated in the Roman Pompeii city is ruined, this container possibly is the predecessor of the vacuum flask, however in fact it is called "the world's first truly thermos Dewar". In 1643, Italian scientist Evangelista Torricelli built a mercury barometer famous vacuum theory. The emergence of this theory thermos really is of great significance, but in the two-and-a-half centuries later, he did not invent the real vacuum flask. In 1879, German physicist Tile for the liquefied gas storage laboratory, he listened to the recommendations of Professor Lide, then used the two middle vacuum thin glasses to make container. He was the author of the papers "Varinholid bottle" in 1881. In 1890, British chemist Shield Williams improved the Varinholid bottles, coated with a layer of silver on the sidewall, which can reduce the heat radiation, slowing the dissipation of heat through the glass,finally the thermos bottle was born.

James Dewar

Modern Thermos Vacuum Bottle
The inventor of modern vacuum thermos bottle is James Dewar, he is a scientist in the Scotland, studied the very low temperature of liquid. In 1892, Dewar was invited to the British Science Institute will research the "liquefied" courses. In order to better teaching, he produced a double-layer glass container, and two layers of bladder wall painted with mercury, greatly reduced heat transfer. Then he deprived the air between the two layers, so the vacuum bottle created and only vacuum bottle is the world's first vacuum flask. The thermos is called Dewar. London Institute holds early Dewar vacuum products. Dewar did not attach importance to the invention of the vacuum bottle, but great importance to the theory of extraction air, and applied for a patent for this theory. In 1902, German Berg saw a huge potential market of thermos bottle , began to sell the thermos, and fought on own the behalf of thermos patent two years. He found the glass inner easily fragmented, so produced with nickel shell to protect the bottles bladder. In the beginning, the thermos bottle is mostly used in laboratories, hospitals and expedition, and later gradually moved into people's daily lives.


Thermos Flask Post Modern Development
In 1904, the Berlin blown glassware worker Boolean added a retaining heat sets to long thermos bottles , so the market would have a storage container of hot coffee or tea. Since then, a variety of thermos flask would come out one after another. It was found that the thermal effects of the thermos bottle stopper are the worst part of the bottle. Later, people used inflated rubber, cork, plastic plugs to replace and improve the insulation effect.



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