Combustion

Combustion is a chemical reaction between a fuel and an oxidising agent that produces energy (heat and light). Can be an exergonic or exothermic chemical reaction. It is also just known as burning - common examples being coal, methane gas, and sparklers. The general equation for this process is:

Fuel + O2 → CO2 + H2O

Complete: The complete oxidisation of fuel. Produces high amounts of energy. Occurs where there is enough oxygen present. Produces CO2 and H2O as major byproducts. Creates a blue-coloured flame.

Incomplete: The partial oxidisation of fuel. Produces low amounts of energy. Occurs where there is not enough oxygen present. Produces CO, carbon dust and soot as major byproducts. Creates a yellow-coloured flame.