Leaching model (soil) Leaching model (soil) A leaching model is a hydrological model by which the leaching with irrigation water of dissolved substances, notably salt, in the soil is described depending on the hydrological regime and the soil's properties. <br> The model may describe the process (1) in time and (2) as a function of amount of water applied. <br> Leaching is often done to "reclaim" saline soil or to "conserve" a favorable salt content of the soil of irrigated land as all irrigation water contains salts. The leaching process in a salty soil to be reclaimed is illustrated in the leaching curves
On the Equilibrium of Heterogeneous Substances is capable of two different kinds of action upon external systems, the two functions which express the twofold capabilities of the system afford an almost equally simple criterion for equilibrium. On the Equilibrium of Heterogeneous Substances In the history of thermodynamics, On the Equilibrium of Heterogeneous Substances is a 300-page paper written by American engineer Willard Gibbs. It is one of the founding papers in thermodynamics, along with German physicist Hermann von Helmholtz's 1882 paper ""Thermodynamik chemischer Vorgänge."" Together they form the foundation of chemical thermodynamics as well as a large part of physical chemistry. Gibbs's "Equilibrium" marked the beginning