Apparatus for the recording of pressure versus volumes and for investigating Boyle's Law. The vertical tube is part-filled with the coloured liquid and sealed. The trapped air is then compressed progressively, with pressure (p) and volume (v) readings taken at each stage. Before each pair of readings is taken, the liquid should be allowed to settle so that the heat caused by the compression is dissipated.
Packed in a foam-lined box with accessories as shown.