Jet fuel is a mixture of a variety of hydrocarbons. Because the exact composition of jet fuel varies widely based on petroleum source, it is impossible to define jet fuel as a ratio of specific hydrocarbons. Jet fuel is therefore defined as a performance specification rather than a chemical compound. Furthermore, the range of molecular mass between hydrocarbons (or different carbon numbers) is defined by the requirements for the product, such as the freezing point or smoke point. Kerosene-type jet fuels (including Jet A and Jet A-1, JP-5, and JP-8) have the majority of their carbon number distribution between  8 and 16 (carbon atoms per molecule) , while more-refined, more-expensive wide-cut or naphtha-type jet fuels (including Jet B and JP-4) have most of their a carbon chains 10 to 14 atoms long for enhanced performance in polar regions. Salvatore J. Rand (ed), Significance of Tests for Petroleum Products (8th Edition) ASTM International, 2010, page 88
Jet fuel is a mixture of a variety of hydrocarbons. Because the exact composition of jet fuel varies widely based on petroleum source, it is impossible to define jet fuel as a ratio of specific hydrocarbons. Jet fuel is therefore defined as a performance specification rather than a chemical compound. Furthermore, the range of molecular mass between hydrocarbons (or different carbon numbers) is defined by the requirements for the product, such as the freezing point or smoke point. Kerosene-type jet fuel (including Jet A and Jet A-1, JP-5, and JP-8) has a carbon number distribution between about 8 and 16 (carbon atoms per molecule) ; wide-cut or naphtha-type jet fuel (including Jet B and JP-4) , between about 5 and 15. Salvatore J. Rand (ed), Significance of Tests for Petroleum Products (8th Edition) ASTM International, 2010, page 88
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