HOTS Questions | Heat | How Does A Thermos Flask Work?

Vacuum Flask or Thermos is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the surroundings of the flask. But, how does a thermos flask work?

Instead of containing any kind of heating or cooling element, so as to keep hot things hot and cold things cold a thermos is designed to in a such a way that it minimizes transfer of heat by not allowing heat to escape or enter easily.
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