The calculations performed in this study were similar to those discussed previously1utilising a computer technique based upon the minimisation of free energy. The programme is capable of handling forty species at each of ten temperatures and a variety of flame stoichiometries can be studied in one operation. In general the concentrations are calculated in moles per mole of feed and those of gaseous species in volume per cent. The effects of nebulising water have been fully investigated on the nitrous oxide- and air-acetylene flames and are hence neglected in this study.