Why thermos will suddenly become not warm?
The simplest and pour into hot water for one minute after touch the skin, if feel significantly warmer is the tip is broken under the kettle bravery, intermediary not vacuum don't keep warm
Hot water is at the bottom of the vacuum flask is bravery of a little correct If it is accidentally touch is broken Into the air in the warm inside So don't heat preservation
To look at the below the hot water inside are pointy little head didn't, that is broken, the thermos is useless ~
Two is double inside, inside the vacuum. Make the heat is not easy to pass out. Bile outer layer is coated with mercury, hot water in the inside heat loss in the process of outward in a most would have been reflected the mercury to also can have heat preservation effect. This two design makes the heat preservation effect of the vacuum flask already can meet the demand of our daily life. His check...
First take a look at why it warm: One, there are three kinds of heat transfer way: heat convection, heat conduction and thermal radiation. Thermal convection mainly occurs between the liquid and gas, heat up, cold flow down, through continuous cycle to achieve dynamic balance, heat conduction on heat conductor, heat from the hot end to the cold end conduction, heat radiation does not need to medium, it to low temperature by means of radiation heat transfer. Thermos bottle between the inside and the shell is the air, the air is a poor conductor of heat, heat conduction to reduce a lot of, inside the internal smooth as a mirror, to reduce the radiation, so the thermos bottle can heat preservation.
