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A vacuum allows no conduction or convection of heat, but still allows radiative transfer. The radiative component may be blocked by a reflective film. Hence your vacuum flask has a silvered finish to the evacuated double-walled container. Even so. there will still be a small conduction of heat through the necessary thermal bridge at the neck of the flask.
What else can I help you with?
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What is the best material for a flag to ensure durability and longevity?
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