A vacuum flask refers to a container that can isolate gas from the outside temperature or a container that isolates external bacteria.
Cosmetic airless bottle:
The contents of the airless bottle can be completely isolated from the air to prevent the product from being oxidized and deteriorated and the growth of bacteria due to contact with the air, and the high-tech concept is used to upgrade the product. The vacuum bottle in the market is composed of a cylinder into an ellipsoid container and a piston placed at the bottom. Its design principle is to use the contraction force of the spring to prevent air from entering the bottle, creating a vacuum state, and to use atmospheric pressure to push the piston at the bottom of the bottle forward. However, because the spring force and atmospheric pressure cannot give enough force, the piston cannot fit too tightly with the bottle wall, otherwise the piston will not be able to move forward due to excessive resistance; on the contrary, if the piston is to be moved forward easily and the material leakage is prone to occur, Therefore, airless bottles have very high requirements for the professionalism of manufacturers.
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 for hot water insulation in the family, 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.
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