Question

Explain how a good thermos slows the flow of heat, Q/t, in terms of conduction, convection, and radiation.

Answer 1

there are three modes of heat transfer that takes place namely conduction convection and radiation.

Convection : for reduction of heat lost due to convection, the space between inner wall and outer wall of thermos are generally made vacuum.

Radiation : The inner walls of the thermos are made silver in color which reduces the radiation losses.

Conduction : The inner walls are made by glass so as to reduce the heat lost by conduction as glass is bad conductor of heat