Diffusion of inhalational agent in the compartments of the body (VRG, FG, MG, VPG) is by partial pressure gradient rather than difference in concentration quoted in volume percent. Perhaps it was pointed out in the presentation that diffusion follows concentration gradient if I understand it correctly. Or am I missing out something here? Thanks in advance for any sharing. Have a good day. Anyway thank you so much for the presentation. It really helps us to clear out a lot of our doubts when comes to effects of cardiac output on washout and awakening. Thanks again