The correlation of transport properties of alkali metal vapours and noble gases

Alexander Apelblat, Paulo S. Fialho, Carlos A. Nieto De Castro

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


It was found that transport properties of gases (viscosity η, thermal conductivity λ, and diffusion coefficients D) in the form of the quantity: C=ηDλTα are temperature independent in the 700-2000 K temperature interval. Although the exponent α seems to be independent inside the group for all the monoatomic vapours it seems to change between different groups (α = 1.909 ± 0.015 for alkali metal vapours - Li, Na, K, Rb and Cs; α = 1.72 ± 0.05 for noble gases - He, Ne, Ar, Kr, and Xe). In this approach, transport properties of gases are correlated using only different values of C. This fact was extended to the properties of the binary mixtures of monoatomic and diatomic molecules in the alkali metal vapours, to obtain the mutual diffusion coefficients D 12(T, p) and the self-diffusion coefficients of diatomic molecules, D 22(T).

Original languageEnglish
Pages (from-to)215-223
Number of pages9
JournalFluid Phase Equilibria
Issue number2
StatePublished - 25 Jan 2005


  • Alkali metal vapours
  • Diffusion coefficients
  • Dimerization
  • Noble gases
  • Thermal conductivity
  • Viscosity

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Physics and Astronomy (all)
  • Physical and Theoretical Chemistry


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