Fuel
any material that stores energy that can later be extracted, in presence of a oxidizer or a catalyser, or under the effect of a tool, but which is not conserved after the reaction / From Wikipedia, the free encyclopedia
A fuel is a substance that is changed in some way to produce heat, electricity, or other forms of energy. This is usually by being burnt in fire, although there are exceptions, such as nuclear fuel. Fuel can be divided into two main types: fossil fuels and other fuels.