What is the principle of the thermos? How to maintain it?

The modern thermos was invented in 1892 by British thermos physicist Sir James Dewar. At that time, he was doing research work on liquefying gas. To liquefy gas at a low temperature, he first needed to design a container that could isolate the gas from the outside temperature. So he asked Berg, a glass technician, to blow a double bottle for him. Two-layer glass container, the inner walls of the two layers are coated with mercury, and then the air between the two layers is sucked out to form a vacuum. This kind of vacuum bottle is also called a "Du bottle", which can keep the temperature of the liquid in it unchanged for a certain period regardless of whether it is cold or hot. Because the thermos bottle is mainly used for hot water heat preservation in the family, it is also called a thermos bottle. The structure of the thermos bottle is not complicated. The middle is a double-layer glass liner, which is vacuumed between the two layers and plated with silver or aluminum. The vacuum state can avoid heat convection. The glass itself is a poor conductor of heat, and the silver-plated glass can radiate the inside of the container outward. The heat energy is reflected. Conversely, if a cold liquid is stored in the bottle, the bottle prevents heat from radiating from the outside into the bottle. Thermos bottle stoppers are usually made of cork or plastic, neither of which conducts heat well.

Maintenance of the thermos:

1. When not in use for a long time, the liner should be fully kept dry.

2. To prevent the occurrence of peculiar smells or stains, please wash it thoroughly with neutral detergent and let it fully dry after use.

3. Tea stains or dirt that are difficult to clean due to long-term use can be fully cleaned by soaking in white vinegar diluted with warm water for half an hour.

4. Please avoid dropping, colliding, or having a strong impact, otherwise it will cause product deformation and affect the use function.