Umbrella term for all variants of Henry’s law constants that are defined in such a way that the numerical value increases with increasing volatility of the solute. Variants include $H_{\mathrm{v}}^{pc}$, $H_{\mathrm{v}}^{px}$, $H_{\mathrm{v}}^{pw}$, and $H_{\mathrm{v}}^{cc}$, as discussed elsewhere in this section.