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Refractive index and density data of gaseous and liquid ethane, propane, n-butane, n-pentane, and liquid n-hexane were fitted to an empirical expression of the Lorentz–Lorenz function proposed by Eisenberg, Reisler, and Minton for application to liquids. This expression takes into account the dependency of the electronic polarizability ?e on density and temperature. This paper presents a way of applying this expression to liquids and gases to compute the density of hydrocarbons with an uncertainty Δρ/ρ?±0.1%.

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