Fuel

Fuel, commonly in the form of gasoline or diesel, is a volatile substance used predominantly to power internal combustion engines. Its scent profile is distinctive and robust, characterized by a sharp, pungent aroma that is often described as both chemical and oily. This characteristic smell originates from hydrocarbons—specifically, a complex blend of aliphatic and aromatic organic compounds. Gasoline, for example, predominantly contains compounds like toluene, benzene, and xylene, which contribute to its strong, slightly sweet, solvent-like odor. Diesel, on the other hand, has a heavier, oilier smell with a hint of sulfur, especially noted in its unburnt form. Both types of fuel emit vapors that can be instantly recognized and are often considered acrid and overpowering, especially in enclosed spaces. The smell is not only a sensory hallmark but also serves as a practical warning sign of potentially hazardous vapors.