Gasoline or petrol is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.

It is comprising a mixture of liquid aliphatic and aromatic hydrocarbons, ranging between C4 and C12 carbon atoms with a boiling range of 30–225°C. It is predominantly a mixture of paraffin, naphthene, aromatics, and olefins.

Gasoline is an energy-dense secondary fuel that can be thought of as an energy currency.

Usage: It is used to power many heat engines, most importantly it acts as a fuel for a large proportion of cars. Gasoline is essential to running most internal combustion engine cars. Because of this, gasoline is one of the most widely used petroleum products. Gasoline makes up about half of all the petroleum products used.