What are the two kinds of combustion?
Complete and incomplete.
Combustion is a reaction, correct? Take this classic combustionreaction: CH4 + 5O2 -> 4CO2 + 2H2O. In technical terms,combustion is only complete if all the methane and all the oxygenare used up in the reaction. In practical terms we considercombustion complete if all the fuel gas converts to CO2, so weprovide an excess of oxygen.
There are two kinds of incomplete combustion. The first is when weprovide enough oxygen to convert all the carbon to either CO orCO2. (We don't worry about the hydrogen - that element is soreactive it's going to grab oxygen first and leave the carbon tofend for itself.) The second is where we provide so little oxygenthe carbon doesn't get a chance to react. This is where soot comesfrom.
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