If you call it by its correct name "vacuum flask" the principle becomes clear. The flask consists of an inner and outer chamber, the space between the chambers is a vacuum. A vacuum cannot conduct heat, hence no losses between the two chambers.
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If you look inside of a thermos you will see metal. This absorbs the heat or the cold and keeps it that way for as long as the contents are in the thermos.
out of steel
inside a thermos is flask steel materials, it keeps the thermos for about 1 - 2 days.
The vacuum reduce heat loss by conduction and convection.
A Thermos.
Thermos flask or vacuum flask.
Yes. The thermos flask can reduce the amount of heat travelling from the surroundings to the cold water
The vacuum flask otherwise known as a thermos flask
There is air between the inside and outside of the flask.
A flask is basically a thermos that is used to hold liquids (beverages) that are meant to be kept warm.
Thermos flask is a thermos container used to store liquids like any hot drink. The liquid added to thermos flask will retain the temperature even after some time irrespective of external temperatures.
The main heat loss in a good thermos flask, is due to heat conducted through the material. (Glass or Stainless Steel). There should be little heat lost through the vacuum of the flask.
As the flask is closed air tight, no convection current is possible.