|Class 8 Chemistry Combustion and Flame||Fuels|
The substance undergoing combustion are termed as combustible substances or fuels. In the above example of Bonfire, wood is used as a fuel. In earlier days people used to cook food from the heat liberated by the burning of coal which was used as a fuel. In modern we cook food using LPG cylinders which is fuel and undergoes burning liberating tremendous heat to cook food.
Fuel can be available in three forms.