Draw a neat and labelled diagram of a thermos
flasks
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Heat transfer is minimized because of ☆
● The vacuum between the two walls, rubber, glass, cork and air do not allow the loss of heat by conduction.
● Cork in the neck of flask and the cup over it prevent loss of heat by convection.
● Heat cannot be lost by conduction or convection because of vacuum between the two walls.
● Heat loss is also minimized by radiation, by making outer surface of inner wall and inner surface of outer wall silvered. The inner wall is a bad radiator and the outer wall is a good reflector of radiation.
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