$f$	fugacity (Pa)
$G^R$	residual Gibbs energy (J)
$G_A^R$	residual Gibbs energy of the adsorbed phase (J)
$K$	dimensionless Henry law constant (–)
$K_P$	Henry law constant (mol kg–1 Pa–1)
$n_i$	adsorbed amount of component i (mol kg–1)
$n_i^{sat}$	saturation capacity of component i (mol kg–1)
$N$	number of moles (mol)
$N_j$	number of moles of species $j$ (mol)
$N_r$	size of lattice in mole equivalents (mol)
$m_j$	mass of species $j$ (kg)
$m_S$	mass of solid (kg)
$M{w}_i$	molecular mass of species $i$ (kg mol–1)
$P$	pressure (Pa)
$P_0$	reference pressure (Pa)
$\tilde{P}$	reduced pressure (–)
$P^{*}$	characteristic pressure of the mixture (Pa)
$P_i^{*}$	characteristic pressure of component $i$ pure (Pa)
$P_{iA}^{*}$	characteristic pressure of component $i$ in the adsorbed phase (Pa)
$P_S^{*}$	characteristic pressure of the solid (Pa)
$P_{ij}^{*}$	pair characteristic pressure (Pa)
$r$	average number of mers in a molecule (–)
$r_j$	number of mers in molecule $j$ in the mixture (–)
$r_j^0$	number of mers in molecule $j$ pure (–)
$R$	ideal gas constant (J mol–1 K–1)
$T$	temperature (K)
$\tilde{T}$	reduced temperature (–)
$T^{*}$	characteristic temperature of the mixture (K)
$T_i^{*}$	characteristic temperature of component $i$ pure (K)
$T_S^{*}$	characteristic temperature of the solid (K)
$\tilde{v}$	reduced molar volume (–)
$v^{*}$	average close-packed volume of mers in a mixture (m3 mer-mol–1)
$v_j^{*}$	close-packed volume of mers molecule $j$ pure (m3 mer-mol–1)
$v_{jA}^{*}$	close-packed volume of mers molecule $j$ in the adsorbed phase (m3 mer-mol–1)
$V$	volume of the lattice (m3)
$V^{*}$	close-packed volume for the mixture (m3)
$V_S$	volume of the solid (m3)
$w_j$	mass fraction of species $j$ (–)
$x_i$	mole fraction of species $i$ in the adsorbed phase (–)
$y_i$	mole fraction of species $i$ in the fluid phase (–)
$z$	compressibility factor (–)
$z^{EoS}$	compressibility factor derived from the Helmholtz energy (–)