write 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.
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Thermos flasks keep hot liquids hot and cold liquids cold for long hours. It consists of a glass vessel with double walls. The glass vessel is enclosed by a metal or plastic cover for protection against damage. The space between the walls is vacuum which reduces the heat loss due to conduction and convection.
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