${\beta }_T$	isothermal solid compressibility (Pa–1)
$\Delta H_0$	adsorption enthalpy at zero loading (J mol–1)
$\Delta U_0$	adsorption energy at zero loading (J mol–1)
${\phi }_i$	fugacity coefficient of species $i$ (–)
${\varphi }_j$	volume fraction in the lattice occupied by species $j$ at close-packing (–)
${\varphi }_S$	volume fraction in the lattice occupied by the solid at close-packing (–)
${\varphi }_j^L$	volume fraction in the lattice occupied by species $j$ (–)
${\kappa }_{ij}$	pair interaction coefficient (–)
${\mu }_i^R$	residual chemical potential of species $i$ in the adsorbed phase (J mol–1)
${\mu }_{iF}^R$	residual chemical potential of species $i$ in the fluid phase (J mol–1)
${\mu }_{i\infty }^R$	residual chemical potential of species $i$ at infinite dilution in the adsorbed phase (J mol–1)
${\mu }_S^{Rm}$	residual chemical potential of the solid on a mass basis (J kg–1)
${\mu }_{S0}^{Rm}$	residual chemical potential of the solid without adsorbates (J kg–1)
$\tilde{\rho }$	reduced mass density (–)
${\rho }^{*}$	average close-packed mass density in a mixture (kg m–3)
${\rho }_j^{*}$	close-packed mass density of molecule $j$ (kg m–3)
${\rho }_{jA}^{*}$	close-packed mass density of molecule $j$ in the adsorbed phase (kg m–3)
${\rho }_S$	mass density of the solid (kg m–3)
${\xi }_{jA}$	volume correction due to confinement constraints (–)
$\mathsf{\Psi }$	reduced grand potential (mol kg–1)