compensation effect

In a considerable number of cases plots of $T Δ ‡ S$ vs. $Δ ‡ H$ , for a series of reactions, e.g. for a reaction in a range of different solvents, are straight lines of approximately unit slope. Therefore, the terms $Δ ‡ H$ and $T Δ ‡ S$ in the expression partially compensate, and

$Δ ‡ G = Δ ‡ H − T Δ ‡ S$

often is a much simpler function of solvent (or other) variation than $Δ ‡ H$ or $T Δ ‡ S$ separately.