How many liters does an old thermos bottle usually have?

The volume of the old thermos bottle is about 2 liters. One liter is equal to one cubic decimeter, two liters is about 4-5 pounds, 1 pound is equal to 454 grams, about 2000 ml, a little more than two liters. It can hold 2 kilograms of water.

The thermos bottle, also called thermos bottle, was invented by British scientist Dewar. 1900, he first changed compressed hydrogen into liquid, that is, liquid hydrogen. This kind of thing should be bottled, but there was no such thermos at that time. He developed it himself. He used the vacuum method, that is, he made a double bottle, which pumped the air out of the interlayer and cut off the conduction. However, the subsequent thermal radiation will also affect the thermal insulation, so Dewar coated a layer of silver or reflective paint in the vacuum interlayer to prevent the thermal radiation from coming back. Plug the bottle with another stopper. In this way, the three ways of heat conduction are cut off, and the bottle liner can keep the temperature for a long time. He used this bottle to store liquid hydrogen.