Ladies The concentration of aromatic components in a solvent typically ethanol or an ethanol-and-water mixture reflect the type of perfume being used. The definitions of various scent types are found in several sources and vary greatly. The concentration, strength, and longevity of the aromatic compounds, or perfume oils, utilised, determine the intensity and longevity of a scent. The strength and persistence of the scent grow together with the percentage of aromatic components. The percentage of perfume oil in the volume of the finished product is used to calculate the approximate concentration of a scent using specific terminology.