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The air between the two walls has been removed to prevent transfer of heat by conduction and convection. These forms of transfer of heat require particles to vibrate or move, which are not present in a vacuum.
The silvered inner wall prevents loss of heat by radiation by reflecting it back into the container.
The outer cover of the flask is made with an insulator of heat, so that heat does not come in or go out by conduction. The airtight lid prevents evaporation and entry for air, so that heat is not lost due to evaporation.
The silvered inner wall prevents loss of heat by radiation by reflecting it back into the container.
The outer cover of the flask is made with an insulator of heat, so that heat does not come in or go out by conduction. The airtight lid prevents evaporation and entry for air, so that heat is not lost due to evaporation.
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