Thermos flask: What is stopper made up of?

The stopper in thermos flask is made up of insulating material to minimize heat loss by convection.

Usually plastic or cork is for making the stopper.

A thermos flask or a vacuum flask is used to keep a hot liquid hot and a cold liquid cold for a long time, by preventing the loss or gain of heat energy due to conduction, convection, and radiation.

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Updated on: 10-Oct-2022

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