How does liquid remain hot or cold for a long time in a thermos

How does liquid remain hot or cold for a long time in a thermos

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A thermo flask is a household item that is used to keep things warm or cold a long time. What is the use of silvered wall in thermo flask?

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How does liquid remain hot or cold for a long time in a thermos flask because there is no loss or gain of heat? - Quora

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