Important physical properties, that characterize a substance, are the density and pressure of saturated vapors (PSV). These parameters need to be known when developing new technological processes in oil refining and chemical industries, designing pipelines, pumping equipment, fuel equipment, hydraulic cleaning processes, calculations related to the amount of petroleum products in mass volume, when operating technical systems running on liquid fuel. For gasoline fractions, the density is a normalized quality parameter, it is an integral part of various combined constants and calculation formulas.