Water vapor sorption is a research area that focuses on the study of the interaction between water vapor and solid materials. This includes understanding how water molecules are adsorbed onto or absorbed into the surface of a material, as well as how these interactions can affect the properties of the material, such as its mechanical strength, thermal conductivity, and chemical reactivity. Researchers in this field typically use techniques such as gravimetric analysis, dynamic vapor sorption, and isotherm analysis to study the sorption behavior of materials and develop models to predict their water vapor sorption properties. Applications of this research area include the development of moisture-sensitive materials, moisture management in pharmaceuticals and food products, and the design of humidity control systems.