Various other substances begin to appear in significant amounts in combustion products when the flame temperature is above about . When excess air is used, nitrogen may oxidize to and, to a much lesser extent, to . forms by disproportionation of , and and form by disproportionation of .
vaRIoUS oThEr sUBStanCes begin To appear iN SiGnIficant amounts iN coMbustioN produCts wheN tHE FlaMe teMperAtURe is aBovE aBOut . wHen ExcEsS AIr IS used, niTRogen mAy OxidiZe to ANd, To a MuCh lesSer extEnt, to . foRmS by diSpROportioNation OF , And and forM bY dIsproportIonation of .