There is so much steam in the hot water bottle, why not violence?
Won't explode completely attributed it to the particularity of the cork material, the plug is the same in the bottled medicine material, is what material, remember not too clear, but when you plug too tight outside or some!
Ideally, inside all the three ways of heat transfer after blocking, thermos of hot water can not cool down permanently. But, in fact, thermos of heat insulation effect is not so perfect, so the thermos insulation there is a limit of time, exceed the time limit, the thermos is no longer warm.
When the thermos into boiling water, the structure of the hot water bottle water heat cannot be passed in the usual way: one is heat convection is cut off. Bottle inside the heated air will find all the possible "export" to go out, outside, into the cold air will be ubiquitous in the thermos. However, because of the bottleneck is fine, and cork plug tightly, so the only way to heat convection is cut off. Second, the heat conduction is blocked. Although compared with metal objects, heat conduction performance of the air is poorer, but the quantity of heat inside still can through the air outside the glass enclosure is passed to the bottle. However, because there are two layers of glass shell, inside the middle and into a vacuum, so the heat conduction medium - the air is very thin, heat conduction channel is blocked. 3 it is thermal radiation is put an end to. Winter, in the sun, we will feel warmer, which is caused by the thermal radiation of sunlight. Due to the hot water inside of a thin layer of silver plating, so the heat radiation reflected by the silver layer and, locked inside the inside, this makes the approach was to eliminate the thermal radiation.
Hot water can heat preservation, is determined by the structural characteristics of hot water inside. It turns out that hot water inside is composed of two thin layers of glass shell, smoke to the air between two layers of the shell, and at the side of the inside of a thin layer of silver plating. Hot water inside there is a much finer than it "body" section of the bottle, the bottle can plug on the cork. It is this structure made the thermos "heart heat, cold appearance" of the vacuum flask.
