Some physico chemical problems were discussed in aluminium electrolysis. The wettability of electrodes(carbon and platinum)by molten electrolyte changes greatly with and without being electrolized. The anode which produces gas will repel the molten electrolyte while the cathode which produces metal will attract it. A see through cell made of fused quartz was used to visualize the metal dissolution process in the cryolite solution. The metal fog formed shows different colors. Aluminium fog is violet,potass...