Fig. 6.1 depicts a cold drink placed inside a thermal jug. The jug cuts down thermal energy transfer from the surroundings to the drink.
(a)[2]
State the names of the two thermal energy transfer processes that the vacuum stops. Explain how the vacuum prevents these two processes of thermal energy transfer.
(b)[4]
The arrows in Fig. 6.2 indicate the direction of water flow in the glass tube as the water is heated. Explain why the water travels like this. Use your ideas about density.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Conduction plus convection” …