(1) For what different purposes do you use thermos flask?
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A thermal flask is an insulating storage vessel that is helpful in lengthening the time in which the contents like milk remain cooler or hotter than in any other vessel...
Explanation:
Thermal flask is used to store hot milk or coffee since it will not become cool very early and we can carry this flasks to any place.
Thermal flask is used to store cool items also like ice water.
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