yeh burning things does create water i know (chemistry student). what i meant was the water in hotter air condesing on colder parts, but im not going to argue it anymore.it may well be the water from burning. i meant this in nicest possible way.. im not looking to start an argument so ill leave it at this
btw butane is c4h10.. just pointing out
di-propene is c3h4 and your last equation isnt balanced, but i get your point anyway...