T	Absolute temperature (K)
P	Air pressure (MPa)
M	Mass fraction of DMSO in DMSO + water mixtures
m 1	Mass fraction of neat DMSO
m 2	Mass fraction of neat water
x e	Experimental mole fraction solubility of PPD
x idl	Ideal solubility of PPD in mole fraction
x van’t	van’t Hoff model solubility of PPD in mole fraction
x Apl	Apelblat model solubility of PPD in mole fraction
x Yal	Yalkowsky model solubility of PPD in mole fraction
x m,T	Jouyban–Acree model solubility of PPD in mole fraction
x 1	Mole fraction solubility of PPD in neat DMSO
x 2	Mole fraction solubility of PPD in neat water
γ i	Activity coefficient of PPD
R 2	Correlation coefficient
RMSD	Root mean square deviations (%)
a and b	Parameters of van’t Hoff model
A, B, and C	Parameters of Apelblat model
J i	Parameter of Jouyban–Acree model
A1, B1, A2, and B2	Parameter of Jouyban–Acree–van’t Hoff model
ΔsolH0	Apparent standard dissolution enthalpy (kJ mol−1)
ΔsolG0	Apparent standard Gibbs free energy (kJ mol−1)
ΔsolS0	Apparent standard dissolution entropy (J mol−1 K−1)
T hm	Mean harmonic temperature (K)
T fus	Fusion temperature (K)
λ max	Wavelength for maximum absorbance (nm)
R	Universal gas constant (J mol−1 K−1)
ΔHfus	Molar fusion enthalpy (kJ mol−1)
ΔCp	Difference in molar heat capacity (J mol−1 K−1)