Dielectric constant of compressed gaseous and liquid oxygen

The dielectric constants of compressed gaseous and liquid oxygen were measured on ten isotherms at temperatures between 100 and 300 K and on the saturated liquid boundary at temperatures between 55 and 154 K. Densities ranged from 0.06 to 1.30 g/cm³ at pressures up to 33 MN/m². The dielectric constant measurements were combined with accurate density data to compute the Clausius-Mossotti (CM) function, $\left(\frac{ϵ-1}{ϵ+2}\right)\frac{1}{\rho }.$ The CM function for oxygen decreases with density from a value of 0.1236 cm³/g at the low density limit to 0.1219 cm³/g near the triple point.