The thermos was invented by 1892. British physicist James? Sir Dewar is conducting a research project on liquefied gases. In order to liquefy gas at low temperature, it is necessary to design a device that can isolate gas from external temperature. So Sir Dewar asked the glass technician Berg to blow a special double-layer glass container for him-the inner wall of the interlayer was coated with mercury, and then the air in the interlayer was pumped out to form a vacuum. This vacuum bottle is named after the inventor and is called "Dewar bottle". It can keep the liquid inside unchanged for a certain period of time, whether it is cold or hot. Due to this special heat insulation function, Dewar bottle is still often used to hold experimental supplies such as low-temperature liquefied gas.
Shortly after the invention of Dewar bottle, German glass technician Berg realized the commercial value of this container. Holder? Berg is also a shareholder of a scientific instrument company in Berlin. 1902, Berg began to sell thermos bottles. 1904, he obtained the patent of thermos bottle in his own name and made a plan to put it on the market. Berg even held a competition to give his thermos a good name. As a result, the award-winning name he chose was Greek "thermos", which means heat. So thermos is also called thermos.