Fig. 5.1 shows a setup used for heating water. The hot water is kept in the metal container.
(a)[3]
Explain why the hot water is found at the top of the container. Refer to density.
(b(i))[1]
State the name of the process that carries thermal energy through the walls of the metal container.
(b(ii))[1]
Suggest one method of keeping the water hot once the heater has been switched off.
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