Concerning the description of mass transport in a porous media, particularly in soil, the question is to know what are the main mechanisms to consider during transport phenomena for a best description of these transports. The answer to this question requires good understanding on thermodynamic law to include in the transport process for a good estimation of the flux of transport. The applications related to water transfer in soil are numerous: the remediation of pollution, the nutrition of plants, etc. The results of this paper show the importance of chemical potential on the mechanisms of transport of water in the soil. Our attention is mainly focused on hygroscopic soils with low water contents (

Chemical Potential, Transport, Hygroscopic Soil