(a(i))[3]
Calculate the pressure on the top surface of the pin.
(a(ii))[1]
Calculate the pressure produced by the point on the wall.
(b(i))[1]
State the name of the device shown in Fig. 4.3.
(b(ii))[1]
State whether anything is present in the space at the top of the tube, above the mercury column.
(b(iii))[1]
Suggest one possible height for the mercury column when atmospheric pressure falls. Give the unit as well.