Some drugs are metabolised as they pass through the skin, in which case the drug-delivery process is modelled as a diffusion-elimination equation: dc t 8c = D- 8x - kc (2) where k represents the elimination rate. (g) Non-dimensionalise equation eqn (2). (h) From eqn (2), what dimensions must the elimination coefficient k have? (i) In this situation, the steady-state molar flux J depends on k as well as on Co, D and h (still depending linearly on Co). Use dimensional analysis to determine the functional dependence of J on these three quantities. (j) What restrictions would your result from part (f) impose on the nature of this depen- dence?