Adsorption 4 Alkali metals 4 Approximation theory 4 Capillarity 4 Capillary condensation (CC) 4 Condensation 4 Fluid dynamics 4 Fluid-adsorber interaction 4 Hysteresis 4 Inert gases 4 Kelvin equation (KE) 4 Liquid condensation 4 Mathematical models 4 Porous materials 4 Thermodynamic properties 4 article 4