(a(i))[1]
State what substance occupies the space labelled P.
(a(ii))[1]
On Fig. 3.1, indicate the vertical length that represents the atmospheric pressure.
(a(iii))[1]
State whether the vertical distance between the mercury surface in the tube and the mercury surface in the dish changes, and if it does, describe how.
(b(i))[1]
Calculate the atmospheric pressure reading shown by the barometer.
(b(ii))[4]
Calculate the new reading of atmospheric pressure given by the barometer.