Mesures sur la constante diélectrique de quelques gaz non polaires (H2, D2, He, O2 et l'air) et CO entre la température ordinaire et 20° abs

Accurate High‐Pressure Measurements of Carbon Monoxide's Electrical Properties

“…this work 255.10 to 313.282.0 to 8.0 Pestak and Chan [25] 132.86 3.49 van Itterbeek and de Clippeleir [27] 273.2 to 372.9n/a van Itterbeek and Spaepen [28] 77.3 to 294.5 0.03 to 0.10…”

“…Generally,t he molar polarizabilities reported in references [25]- [30] are inconsistent at comparable conditions. Even when discarding the data by van Itterbeek and Spaepen [28] as unreliable, ar elative scatter of about 10 %a nd am aximum absolute scatter of AE 1cm 3 mol À1 around an average value of approximately 5cm 3 mol À1 can be observed. At conditions near ambient, i.e.,d ensities of 0.04 mol dm 3 at temperatures between (294.1 and 298.2) K, the literature molar polarizabilities [26,27,29] range approximately from (4.7 to 5.3) cm 3 mol À1 .M olar polarizabilities calculated from the dielectric permittivities reported by Forró [26] in 1928 have al arge scatter and no apparent dependence on temperature or density.M oreover,t he data published by van Itterbeek and Clippeleir [27] are not consistent with Debye's theory (Equation (3)) as they exhibit an increase in polarizability with temperature.…”

“…The measured dielectric permittivities available in the literature [25][26][27][28][29][30] for pure CO are summarised in Table 1. No experimental values for the dielectric permittivity of CO could be found for pressures beyond0 .61 MPa, [26] except the value at the critical point (p cr = 3.49 MPa [31] )r eported by Pestak and Chan [25] (the authors investigated the relative changes in the dielectric permittivity in the critical region;n oa bsolute values were reported in their work, except for ad ielectric permittivity measurement at the critical point).…”

“…Review of the dielectricp ermittivity measurementsf or carbon monoxide.T he standard uncertainties in T, p and e r for this workw ere 0.02 K, 0.001MPa, and less than5 2ppm,r espectively.N ou ncertainties were reported for any of the literature data in Refs. [25][26][27][28][29][30]. Pestaka nd Chan [25] reported relative changes in the dielectric permittivity as well as one valuea tthe critical point.…”

“…Until now,v alues reported for the dielectric permittivity of CO were available in the temperature range from (77.4 to 572.2) Ka nd only at pressures up to 0.61 MPa except for asingle dielectric permittivity measurement at the critical point. [25] In Figure 5, we compare the molar polarizabilities determined in this work with experimental values derived from all the available literature [25][26][27][28][29][30] as af unction of temperature (a, top panel) and density (b, bottom panel). Generally,t he molar polarizabilities reported in references [25]- [30] are inconsistent at comparable conditions.…”