The hydration energy of elementary soil particles of different sizes

The mathematical analysis of the data on the sorption of vapor moisture by the granulometric fractions of a loamy soil has for the first time indicated that an inverse linear relationship occurs: (1) Between the soil-moisture content and the logarithm of the moisture total potential (pressure) (probably as a result of the hydration of exchangeable cations that form a diffuse layer near the surface of the solid phase); (2) Between the soil-moisture content and the logarithm of the mean diameter of elementary soil particles (probably, as a result of differences in their specific surface determined by various mineralogical compositions); and (3) Between the hydration energy of elementary soil particles and the logarithm of their diameter.