What is the concept of inventing thermos?

The concept of thermos bottle is simple: the bottle has an inner wall and an outer wall; There is a vacuum between the two walls, and there is nothing. Heat cannot be transferred through vacuum, so any liquid poured into the bottle can keep its original temperature for a long time. This is why thermos can keep warm in winter and cool in summer. Many people who have traveled many times find it hard to imagine what it would be like without a thermos.

But the thermos was not invented until 1892, although its inventor, Scottish scientist james dewar, didn't realize how useful it would be.

1892, British physicist Sir James Dewa was engaged in the research project of liquefied gas. 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 a patent for 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.