The modern thermos flask was invented by the British physicist Sir James Duva in 1892. He was working on a study of liquefied gases, gas to liquefaction at low temperatures, first need to design a gas to insulate the external temperature of the container, so he asked Glass technician Berg for him to blow a double-layer glass containers, two layers of the wall coated with mercury, and then pumping out the air between the two layers, forming a vacuum. This vacuum bottle is also called "du bottle", can make the liquid in the inside, regardless of cold, hot temperature to maintain a certain amount of time unchanged.
Because in the family thermos bottle is mainly used for hot water insulation, it is also called Thermos. The structure of thermos flask is not complicated, the intermediate is double glass bottle gall, the vacuum vacuum state between two layers, and silver-plated or aluminium. The vacuum state can avoid heat convection, the glass itself is a hot bad conductor, the silver plated glass can be inside the container to radiate the heat reflected back. Conversely, if the bottle is stored in a cold liquid, this bottle can prevent the outside heat from radiation into the bottle.
Bottle stopper, usually made of cork or plastic, the two materials are not easy to heat. Thermos flask Shell has bamboo, plastic, tin, aluminum, stainless steel and other materials made, thermos bottle has a rubber washer, the bottom of the bottle has a bowl of rubber cushion, these are to fix the glass gall to prevent collisions with the shell.
Thermos flask of heat preservation, cooling function is the worst place around the bottleneck, heat is more in the use of conduction flow. Therefore, when manufacturing always shorten the bottleneck as much as possible, the larger the capacity of the bottle mouth smaller thermos flask, the better insulation effect. Under normal circumstances, within 12 hours can make a bottle of cold drinks at 4 ° C, boiling water in 60 ° C.
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