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Benzene is an organic chemical compound discovered in 1823 by Faraday.


Hydrocarbon is an organic chemical compound of hydrogen and carbon in gas, liquid, or solid phase. Hydrocarbons can vary from pure methane to massive, complex mixtures. Fossil fuels are made up of hydrocarbons. In-vehicle emissions, these are usually vapours created from incomplete combustion or vaporisation of liquid gasoline.


Petroleum in its natural form before it is processed is known as crude oil, the colour can be green, black, dark, brown or clear, thick like tar or thin like gasoline; and are liquid under normal conditions of temperature and pressure