A batch of a certain substance (a simple system) is held in a constant volume, rigid container. The system experiences an infinitesimal change of state during which the pressure rises. The question is whether during this constant volume pressurisation process the system is being colled or heated. Show that the constant volume pressurization is teh result of heating is the systems properties vary such that (k/beta)Cv>0 , where k and beta are isothermal compressibility and volumetric coefficient of thermal expansion respectively.