Write the uses of thermos flask?
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Explanation:
A thermos is a container that is used to keep items—usually food or drinks—hot or cold over a period of time. It uses thermal insulation to prevent or inhibit the transfer of thermal energy from one area to another.
The principle involved consists of surrounding a container with material that is a good thermal insulator, which is a material that will not conduct heat or cold. A unique way of keeping material its original temperature is to use a vacuum as an insulator.
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