(a)[3]
Explain, using electrons and the atoms in the metal, how thermal energy passes through the walls of the metal cylinder.
(b(i))[1]
Because the piston is held fixed, the gas pressure rises as the gas temperature rises. State how the motion of the gas particles changes as the temperature increases.
(b(ii))[3]
Explain, using the gas particles, why the pressure exerted by the gas on the walls of the metal cylinder rises as temperature rises.
(c(i))[1]
The gas in the cylinder reaches a temperature of 100 ^{\circ}C. When the piston is released, it moves to the right. The temperature stays at 100 ^{\circ}C. The gas pressure then falls. Explain, in terms of the gas particles, why the gas pressure now decreases.
(c(ii))[2]
At last, the piston comes to rest. Explain why.