The inventor of our modern thermos is Sir James Dewar, a British scientist who studies liquids at very low temperatures. In 1892, Dewar was invited to the British Institute of Science to "liquefied gas" courses. In order to make the teaching better, before he went, he asked a glasssmith named Berger to make a double-layer glass container and fill the two layers of gallstone with mercury to greatly reduce the heat transfer. Then he pumped off the air between the two layers, and the vacuum bottle appeared. This vacuum bottle is the world's first thermos, which is called the "Dewar". In the London Institute of the United Kingdom, the early Dewar vacuum products are still preserved. At the time, Dewar did not pay attention to the invention of the vacuum bottle, but paid great attention to the theory of extracting air and applied for a patent for this theory. In 1902, the German Berger saw the vast potential market for thermos, so he began to sell thermos. Two years later, he won the patent for the thermos in his own name. He found that the glass bottle was very easy to break, and the outer casing was made of nickel to protect the bottle. Initially, thermos were mainly used in laboratories, hospitals, and expeditions, and later gradually entered daily life.
In 1904, the Bourbon, a worker who blown glassware in Berlin, studied and added a heat-receiving sleeve to the Jura bottle, so that there are containers for storing hot coffee or black tea on the market, and a variety of thermos bottles have been used. It has come out one after another. It has been found that the warmth of the thermos stopper is the worst part of the bottle. Later, people replaced the cork with expanded rubber and plastic plugs to enhance the insulation effect.