Describe the construction of a thermos flask.
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Answer:
a double-walled container made of glass or stainless steel.
Explanation:
The outer casing of a thermos flask is made up of plastic or metal. Plastic, being a poor conductor of heat, acts as an insulator preventing the heat loss through conduction. Inside it, is a double-walled container made of glass or stainless steel. Both the walls are polished so they are shiny.
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