Fuels
Substances or materials which undergo combustion are called fuels. The most common examples are kerosene, diesel, petrol, charcoal, coal, wood, etc.
A good fuel is one which is readily available, is cheap, burns easily in air and at a moderate rate, has a high calorific value and is environment friendly. There is probably no fuel which can be considered an ideal fuel.
Read more about this topic: Combustion