(a)[1]
Define what pressure is.
(b)[3]
Explain, in terms of the air molecules, why the pressure at the top of a mountain is less than at sea level.
(c(i))[3]
Fig. 3.1 shows liquid in a cylindrical container. The container has a cross-sectional area of $0.450\,\text{m}^2$. The height of the column of liquid is $0.250\,\text{m}$ and the density of the liquid is $13600\,\text{kg m}^{-3}$. Calculate the weight of the column of liquid.
(c(ii))[1]
Calculate the pressure on the base of the container caused by the liquid's weight.
(c(iii))[1]
Explain why the pressure on the base of the container is different from the value found in (ii).