Airless bottle news

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 could isolate the gas from the outside temperature. So he asked the glass technician Berg to blow a double for him. Layer glass container, two layers of inner walls are coated with mercury, and then the air between the two layers is evacuated to form a vacuum