Why a glass of water in the thermos for one or two days or hot
Inside of the thermos is the insulating layer (typically for vacuum), in a sealed case, to slow the speed of the temperature decrease.
Open bottle inside a vacuum layer, bright silver plating film glass wall surface reflection infrared thermal radiation, high temperature, so the bottle contents of heat energy outward radiation, not boiled water in the thermos bottle can heat preservation! A cup of hot water in the air, the temperature is higher than air, heat will be scattered into the air, cool...
Because material, the glass heat faster, thermos bottle can slow the cooling speed, play an important role, he is in a vacuum state, with a cork can play a role
