Burning pot is actually better heat preservation effect of the vacuum flask, both on the same principle, only the material is not the same, burning pot of insulation material is better than general heat preservation pot, so can have a "burning" the effect.

　　Actually it is one thing to heat and cold insulation, heat preservation is to keep the temperature, 80 degrees or 0 degrees, it is try our best to maintain the original temperature, because there is no convection airflow, conduction, external environment temperature can't go in, keep the temperature of the inside can not come out, so have the insulation (cold) effect, which is why burning pot can keep hot, cold and to keep working principle. Actually very simple, is designed by insulating the burning pot, try to reduce the heat transfer principle.