An extended equation of state for gaseous methane determined from the speed of sound

Virial coefficients of hard-core attractive Yukawa fluids

“…These coefficients play a vital role in understanding the gas-phase molecular clustering phenomena in simple Lennard-Jones fluids [5] and real fluids such as water [6,7]. Virial coefficients of fluids [8][9][10][11] can be determined by a number of different experimental methods [12][13][14] and from many correlations such as due to Meng et al [15][16][17][18], and Tronopoulos [19,20] which are based on corresponding states principle. These experimental methods and correlations are useful only for the calculation of second and third virial coefficients.…”

Virial coefficients of nitrogen from a quadrupolar site–site potential function

“…However, at low reduced temperatures second and third virial coe±cients of nonspherical molecules determined in this manner have exhibited clear signs of systematic deviations from experimental values. 5,6,[8][9][10] These deviations are probably due, in part, to errors in the experimental virial coe±cients, but also due to inaccuracies in the models which only become apparent at low temperatures. In the case of the second virial coe±cient of nitrogen, it was shown that agreement between calculated and experimental values improved markedly when the isotropic potential in the model was replaced with an anisotropic pair potential function.…”

Comment on “An equation of state for gaseous argon determined from the speed of sound”

“…We strongly discourage from its use, particularly as correct parametrizations for fourth- [14] and higher-order [18] virial EOS for Argon have been reported recently. We also discourage from employing ad hoc ''approximations'' [7,[10][11][12][13] to the 3-body or, generally, the non-additive contributions to D, and have shown that such ''approximations'' may, in fact, overestimate these contributions significantly. We consequently disagree with Ref.…”

“…[1] -similarly to elsewhere [10][11][12] and to Trusler [13] -cites diagrammatic works of Casanova et al [6] and Dulla et al [7], neither justify to discard products of f ijk 's in any other than an ad hoc fashion.…”