Watson Equation: For Hvap for the liquid-gas phase boundary

ln(Hvap/Hvapo) = a1 + åai ×Tri-2 ×ln(1-Tr) , where the summation is from i = 2 to nTerms

Tr = T/Tc, Tc is the critical temperature, and Hvapo = 1 kJ/mol

 

Evaluation Results:
annotated evaluation results showing constant parameter T_c and fitted parameters (top to bottom): a_1, a_2, a_3, a_4

The example is for fitted enthalpies of vaporization for benzene.