(a(i))[1]
The height $h$ represents the atmospheric pressure value. State what is in the space labelled S.
(a(ii))[2]
Calculate the value of $h$ shown by the barometer.
(a(iii))[2]
State and explain whether the vertical height of mercury in the tube is smaller, the same, or greater than the value calculated in (a)(ii).
(b)[2]
Suggest and explain a reason for the smaller value.