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. Jet fuel is therefore defined as a performance specification rather than a chemical compound. 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 a mixture of a variety of hydrocarbons. The only other jet fuel commonly used in civilian turbine-engine powered aviation is Jet B, which is used for its enhanced cold-weather performance. The most commonly used fuels for commercial aviation are Jet A and Jet A-1, which are produced to a standardized international specification. It is colorless to straw-colored in appearance. Jet fuel or aviation turbine fuel ( ATF, also abbreviated avtur) is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines.
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