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How does the aluminum coating help preserve the temperature of the hot and cold drinks?

The interior surface of a thermos bottle is coated with a thin film of shiny aluminum. How does the aluminum coating help preserve the temperature of the hot and cold drinks?

Public Comments

1. It minimises heat loss/gain due to radiation.
2. As answered previously, the shiny coating reflect thermal radiation back to the bottle, but also an outer coating of a high specific heat substance should be used to prevent heat transfer due to conduction.