Dielectric Properties of Slightly Polar Organic Liquids as a Function of Pressure, Volume, and Temperature

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Abstract
The dielectric constant and density have been measured simultaneously for carbon tetrachloride, carbon disulfide, isopentane, and toluene. The Clausius–Mossotti polarization for all liquids at constant temperature shows a linear decrease with increasing density. Only isopentane and toluene show a temperature dependence of the Clausius–Mossotti polarization at constant density consistent with the presence of a permanent dipole moment. The dipole moments derived from the constant density data are 0.105 D for isopentane and 0.332 D for toluene. Also, the Böttcher–Onsager equation is shown to be incompatible with the measured data.

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