The fourth virial coefficient is calculated exactly for a fluid of hard spheres in even dimensions. For this purpose the complete star cluster integral expressed as sum two three-folded integrals only involving spherical angular coordinates. These are solved anallytically any dimension d and working with existing expressions other terms we obtain an expression B4(d) that sums finite number simp...

The third interaction virial coefficient Caww for a ir-water vapor mixtures is estimated in the temperature range 0 to 100 °C, by means of an approximate method based on molec ular assoc iation . The res ult s are believed accurate to within a fac tor of two. The value of CawlV can be combined with prev ious es timates of the other interaction coefficient C",m and the values of the third virial...

based on the carnahan and starling hard sphere equation of compressibility, an equation of state has been derived. conditions that must be met by all equations of state are applied in order to obtain attractive term or non - ideal compressibility term of the equation. second virial coefficient and acentric factor arc used in the derivation of the equation of state. in this equation, compressibi...

We present methods for computing contributions to the virial coefficients uniquely associated with molecular flexibility, and we demonstrate their use with application to the third, fourth, and fifth virial coefficients of united-atom models of linear alkanes and methanol belonging to the suite of transferrable potentials for phase equilibria (TraPPE-UA). We find that these uniquely flexible co...