A solvent parameter defined by: $$Sp=1-\frac{M}{M\left(\text{hexadecane}\right)}$$ derived from the Gibbs energy of transfer (${\mathrm{\Delta }}_{\text{t}}{G}^{\text{⚬}}$) of a series of solutes from water to numerous aqueous-organic mixtures and to pure solvents: $${\mathrm{\Delta }}_{\text{t}}{G}^{\text{⚬}}\left(\text{to solvent}\right)=M{R}_{\text{T}}+D$$ where $R_{\text{T}}$ is a solute parameter, and $M$ and $D$ characterize the solvent. The $M$ values are used to define a solvent solvophobic effect so that $Sp$ values are scaled from unity (water) to zero (hexadecane).