Like if there is a hot liquid in there how does it know to keep it hot? if these is a cold liquid in there how does it know to keep it cold? Thermoses are smart.
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A thermos is a container that is used to keep items—usually food or drinks—hot or cold over a period of time. The principle involved is to surround a container with material that is a good thermal insulator, which 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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good thermal insulator, which will not conduct heat or cold
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Do the thermos sensors read out in Kelvin or Rankin?