DIELECTRIC PROPERTIES OF SLIGHTLY POLAR ORGANIC LIQUIDS AS A FUNCTION OF PRESSURE VOLUME AND TEMPERATURE

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.