sorptioisotermina

Sorptioisotermina is a term used in soil physics and engineering to describe a temperature‑independent measure of moisture movement through porous media. The concept originates from the classical sorption isotherm but extends to capture the rate of water uptake by soil or concrete when the temperature remains constant. It is defined as the derivative of the water content with respect to the hydraulic gradient under isothermal conditions and is typically expressed in units of centimeters squared per hour.

Researchers have applied sorptioisotermina to predict infiltration rates in agricultural lands, to model the drying behavior of concrete at different relative humidities, and to assess the durability of building envelopes where temperature fluctuations are minimal. Because the parameter is independent of temperature, it allows for direct comparison between sites or materials that otherwise would require extensive temperature correction. In practice, measurements are taken using a dual‑pulsed neutron moisture probe or by gravimetric methods at controlled environmental chambers, and the resulting sorption curves are fitted to derive the coefficient.

Despite its theoretical appeal, the use of sorptioisotermina remains limited to specialized research. Its calculation requires detailed knowledge of the soil's microstructure and the assumption of a linear relationship between hydraulic gradient and moisture flux, which does not hold in all circumstances. Nevertheless, the parameter offers a valuable tool for engineers and scientists who need to isolate the effect of moisture transport mechanisms from the confounding influence of temperature variations.