There is ample evidence, particularly for small-sized particles (Vincent and Clement 2000), that metallic aerosols are very hazardous to health. Their formation involves evaporation at high temperatures and subsequent condensation, processes which occur in industrial activities ranging from welding to steel manufacture. The origin of the wide size distributions observed in experiments on their formation with the presence of tiny particles (Buckle and Mawella 1987) is attributed to molecular diffusion being much larger than particle diffusion.
