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cold liquid
hot liquid
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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.
It is too cold for liquid water to exist on the surface
The primary function of a thermos flask is to keep liquids hot or cold. There is an outer protective layer with a hollow area inside before the actual area where the liquid is stored. Heat or cold gets trapped in the hollow area and that is what keeps a liquid hot or cold.
A vacuum flask keeps hot things hot & cold things cold. Just how it tells the difference is one of the mysteries of the scientific world !
Thermos Flask is a container that is used to prolong the temperature of a liquid. If a liquid it is hot,the thermos flask will work to make it stay hot longer. The heat will have no way to escape the flask which means the heat will stat longer, causing the liquid to stay hot longer.
There is no way to permanently store heat. The most you can expect, from a high-quality vacuum flask, is to keep the liquid cold, or hot, for a fairly long time. But gradually, some heat will seep in, or out, until the temperature in the vacuum flask will be equal to the temperature of the surroundings.
cold liquid
A thermos flask full of hot liquid will stay hot for a time in an operating refrigerator.
hot liquid
Due to open space isolating the flask from external temperature
hot liquid
A flask. It also keeps drinks hot.
A vacuum is the answer.
To reflect radiation back, where from it is coming. So hot contains will remain hot and cold will remain cold.