(a)[1]
Define what density means.
(b)[2]
Explain how the difference in the densities of solids, liquids and gases can be linked to the spacing of their molecules.
(c(i))[2]
A paving slab has a mass of $68\,\text{kg}$ and dimensions $50\,\text{mm} \times 600\,\text{mm} \times 900\,\text{mm}$. Calculate the density, in $\text{kg m}^{-3}$, of the material used to make the paving slab.
(c(ii))[3]
Calculate the maximum pressure a slab could exert on the ground when it is resting on one of its surfaces.