Fuel, Fuel Oil
Any combustible substance that generates heat, power and energy when ignited can be classified as a fuel. Coal, wood, petrol and diesel are good examples of commonly used fuels.
Heavy commercial fuels obtained from crude oil are called fuel oil. Some facts about fuel oil are:
- Comprises of long hydrocarbon chains
- Are highly combustible
- Employed to generate heat or power in boilers, furnaces and engines
Types of Fuel
Fuel can be classified into the following categories:


