thermodynamics of small systems Hill's thermodynamics of small systems Kirkwood-Buff integrals Physics Science: general issues Technology: general issues activated carbon adsorption capillary fiber bundle model confinement differential pressure electrohydrodynamics (EHD) entropy of adsorption equilibrium finite size correction flow in porous media high-pressure methane adsorption hills-thermodynamics hydration shell thermodynamics ideal gas integral pressure interface molecular dynamics molecular simulation nanoparticles nanopore nanothermodynamics non-Newtonian fluids polymers pore