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Aeronautics, Aerospace, Aviation, Business, Chemistry, Engineering, Geography, Geology, Natural sciences, Petrochemistry, Petrology, Physical sciences Of jet fuel Composed of a mixture of hydrocarbons with a wide range of boiling points, including both moderately-heavy, higher-boiling kerosene-type molecules and lighter, lower-boiling, more-volatile gasoline-type molecules; Jet B or JP-4 is a fuel of this type.