How Much Do You Know About Airless Bottles

The modern thermos was invented in 1892 by the British physicist Sir James Dewar. At that time, he was conducting a research work to liquefy gas. To liquefy gas at low temperature, he first needed to design a container that can isolate the gas from the outside temperature. So he asked the glass technician Berg to blow a double for him. Layer glass container, the inner walls of the two layers are coated with mercury, and then the air between the two layers is evacuated to form a vacuum. This kind of airless bottle is also called "Du bottle", which can keep the liquid in it at the same temperature for a certain period of time regardless of cooling or heating. Since the thermos bottle is mainly used to keep hot water in the home, it is also called a thermos bottle. The structure of the thermos is not complicated. In the middle is a double-layer glass bottle. The two layers are vacuumed and plated with silver or aluminum. The vacuum state can avoid heat convection. The glass itself is a poor conductor of heat. The silver-plated glass can radiate the inside of the container. The heat is reflected back. Conversely, if cold liquid is stored in the bottle, the bottle can prevent the external heat from radiating into the bottle.