International Journal of Thermophysics

, Volume 9, Issue 1, pp 117–130 | Cite as

Mean polarizabilities and second and third virial coefficients of the gases C2H4, C2H6, and SF6

  • H. Häusler
  • K. Kerl


Mean polarizabilities α00, T) as well as second and third virial coefficients B(T) and C(T) of the equation of state of the gases C2H4, C2H6, and SF6 have been determined from refractive index measurements with a Michelson interferometer for wavelength λ0=632.99 nm in the overall ranges 250 K⩽T⩽ 340 K and 0⩽p⩽3 MPa of temperature T and pressure p. Some negative C(T) values at low temperatures have been obtained. The C(T) data could be fitted satisfactorily to the simple three-parameter function C(T)= a(T−T0) exp[ −b(T−T0)], with the maximum near the critical temperature Tc. A possible correlation between C(T) and the vapor pressure pv(T) is discussed.

Key words

polarizability refractive index virial coefficients C2H4 C2H6 SF6 


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Copyright information

© Plenum Publishing Corporation 1988

Authors and Affiliations

  • H. Häusler
    • 1
  • K. Kerl
    • 1
  1. 1.Institut für Physikalische und Theoretische Chemie der Technischen Universität BraunschweigBraunschweigFederal Republic of Germany

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