1.Draw a labelled diagram of a thermos flask and explain how the transfer of heat is minimised in it.
Answers
Answer:
Heat transfer is minimised because of: (1) The vacuum between the two walls, rubber, glass, cork and air do not allow the loss of heat by conduction. ... (4) Heat loss is also minimised by radiation, by making outer surface of inner wall and inner surface of outer wall silvered
Answer:
The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plastic case. The outer surface of its inner wall and the inner surface of its outer wall are silvered. This prevents heat transfer due to radiation. The space between the two walls is almost vacuum and the walls are sealed at the top. The double-walled glass vessel and vacuum prevents heat loss by conduction. The insulating stopper or cork at the top minimizes heat loss by convection.
