What type of combustion occurs when there is a plentiful supply of #O_2#?
I'll say it's complete combustion.
For complete combustion, which is just "normal" combustion so-to-speak, is when a substance burns in the presence of oxygen (air). It's generally understood that the oxygen is present in excess.
On the contrary, incomplete combustion is when there is not enough
For complete combustion of a hydrocarbon, for example liquid propane (
For incomplete combustion (deficiency of oxygen), the products are instead
Which you can see uses up less oxygen.
This process is rather undesirable, because it can also produce soot (carbon) and poisonous carbon monoxide.