Introduction To Vacuum Flask

The modern vacuum flask was invented by the English physicist Sir James Dewar in 1892. He was on a gas liquefaction research work, liquefied gas in low temperature, first of all need to design a can make the gas container sealed off from the outside temperature, so he please glass technician berger for him blowing a double deck glass container, two layers of wall coated with mercury, and then take away the air between the two layers, forming a vacuum. This kind of vacuum bottle is also called "du Bottle", which can keep the temperature of the liquid inside, whether it is cold or hot, constant for a certain period of time. Because in the family the thermos bottle mainly USES in the hot water heat preservation, therefore also calls the thermos bottle. The construction of a vacuum flask is not complicated. The vacuum state can avoid heat convection. The glass itself is a bad conductor of heat. The silver-plated glass can reflect back the heat energy radiated from inside the container. Conversely, if a cold liquid is stored inside the bottle, it prevents the heat from radiating from the outside.