d = dsat / [1 - c×ln{(b + p) / (b + psat)}] ; where
b = åBi+1×t i,
c = åCi+1×t i, and
t = (T-Tcenter)/100, where Tcenter is a constant parameter.
Summations are from i = 0 to nTerms - 1, where nTerms is the number of B or C terms.
dsat = the density of the saturated liquid and psat = the saturation vapor pressure.
The complete formulation used in TDE is given as equation 6 in the article:
Diky, V.; O'Connell, J. P; Abildskov, J.; Kroenlein, K.; Frenkel. M.; Representation and Validation of Liquid Densities for Pure Compounds and Mixtures. J. Chem Eng. Data 2015, 60, 3545-3553.
The quantities T*, V*, and C* are defined in equations 2 through 4 of the article. For a given temperature, the required reference pressure and reference density are the values at vapor saturation.