Hygroscopic water

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Hygroscopic water (adsorption water) - a thin layer of water formed by the adsorption of water vapor particles from the air on the free surface of the solid. It consists of a monolithic monolayers layer with a very large electrostatic charge and a loosely bound adsorption layer. This structure is disturbed by the presence of ions. It depends on temperature, relative humidity and air pressure. Next to capillary water and free water is one of the elements determining the water content of the soil. The sample content of hygroscopic water in bentonite is about 14%.

Hygroscopic water is so strongly bound that it does not have the ability to wet other bodies in contact with the surface on which it is located. Hygroscopic water occurs naturally on many surfaces, such as glass. Getting rid of it requires drying the surface at very high temperatures.

Hygroscopic water does not transmit hydrostatic pressure, its molecules have no ability to dissolve or move. They can surround the mineral grains partially or completely. The complete saturation of the grain surface with water particles is called maximum hygroscopic moisture.

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