Meticulously prepared, this reference offers an overview of achieved in gas-solid (G/S), liquid-solid (L/S), and gas-liquid (G/L) adsorption research. It emphasizes the interpretation and application of various hypotheses, providing mathematically and thermodynamically accurate assessments. The book covers how to calculate mono- or multilayer adsorption, the structure of an adsorbed layer, the kinetics of each process, changes in free energy of surface, and exact isotherm equations when measuring a G/L, G/S, or L/S isotherm. Other topics include rare-gas adsorption, "supercritical region" isotherms, hydrophobic solid-water interfaces, and more.