(a)[2]
Explain, in terms of momentum, how molecules of the gas apply a force to a wall of the container.
(b(i))[1]
Calculate the pressure at level Q, in mm of mercury (mm Hg), from the atmosphere together with the mercury above Q.
(b(ii))[1]
State the pressure due to the air in the left-hand arm of the tube.
(b(iii))[3]
Calculate the trapped air’s new volume.