Heard that just bought thermos to preheat how advance??
Because there are heat insulation layer, a new never used, it is cold, used to warm up first.
New thermos remember that don't pour cold water, otherwise the effect after the heat preservation effect, can be less hot water first, the water temperature in 80-90 degrees, the water in the thermos flask, thermos bottle is made of four 5, which is placed into the cork, after a night of pull pull the cork, with palms on top place to feel the heat, only lukewarm thermos heat preservation effect in general, more heat, heat preservation is good, on the contrary, a night in a bottle water will drop a lot of, heat preservation is not good. After test, the water in the bottle can flush the tank with, (can't use cold water). After wash into boiled water.
Alas, few pour boiling water first sway under two even if preheating, afraid you pour too much to the shock.
Pour warm water flash slowly, a few more times, because the new cool inside will be afraid to encounter overheat water burst
Because the newly purchased will have unpleasant taste, very hot a few times with hot water would be much better.
