-Demonstrate diffusion of gases; -State the relationship between the rate of diffusion and density of gas/vapour; -Show how heat affects the volume of a given mass of gas; -Explain the Kelvin Scale of temperature and its relationship to the Celsius Scale; -Explain the effect of pressure on the volume of a gas; Explain the effect of temperature and pressure on a given volume of gas; Show that PV = nRT is the general gas equation.