This lecture should give an overview over the modelling of mass transfer in porous media, such as soils or building materials. The main focus is water transport as a two-phase flow in partially saturated pore systems. The underlying flow pyhsics, e.g. diffusion and hydraulic conductivity, and their interaction will be discussed. Main content is:

-       Water retention curve
-       Sorption isotherm
-       Pore volume distribution
-       Richards equation
-       Mass balance
-       Capillary suction
-       Knudsen diffusion
-       Kelvin equation