(a)[1]
State which of the metal, the water or the air expands the most.
(b)[2]
Fig. 3.1 shows the metal at 20 ^{\circ}C. It is a large square sheet with a square hole in the centre, lying flat on a table. On Fig. 3.1, sketch the outlines of the sheet and the hole after the metal is heated. The expansion should be clearly visible.
(c(i))[1]
Define density in words.
(c(ii))[2]
Calculate the volume occupied by the metal. Give the answer to a suitable number of significant figures.