What is a hot water bottle?
Thermos bottle has a into a vacuum inside the glass. Thermos bottle inside is glass layer, and glass vacuum around it. Glass inside easily broken, so will it wrapped in plastic or metal enclosure. Many thermos is actually can unscrew and remove the inside of glass. The thermos is one step. Silver plating treatment was conducted on the glass (like a mirror), in order to reduce the infrared radiation. The combination of vacuum and silver plated greatly reduces the convection, conduction and radiation heat transfer.
To make like a thermos containers, one way is to take a pot, wrap it up with foam insulation. Insulation works, for two reasons. First of all, the bubble in the plastic is a poor conductor of heat. Second, the air bubbles trapped in more conducive to heat conduction. So will lower conductivity. Because is separated into tiny air bubbles, foam insulation in the very great degree also have played an important role in eliminating bubble internal convection. So, after a bubble of heat transfer is very little.
Hot water bottle, also known as vacuum flask, was invented by England's scientists dewar. In 1900, the first time make the compressed hydrogen gas into a liquid, the liquid hydrogen. This kind of things have to bottle up, but not now at that time the vacuum flask. By vacuum method, namely to make double bottle, the air in the compartment of smoke, to cut off the transmission. But after heat radiation, that may affect the heat preservation, Yu Shidu tile in the interlayer of vacuum and coated with a layer of silver or reflective coatings, the thermal radiation back. The bottle with a stopper blocked again. Such three ways of heat transfer was cut off, bottles of bladder can keep the temperature for a long time. Use the bottle to store liquid hydrogen.
