Some type of gels like gelatin loose water slowly The process is known as:

The removal or expulsion of a liquid from a gel is known as syneresis. For instance, when lymph drains from a blood clot that is constricting.
Shear thinning is a characteristic of thixotropy. When shaken, agitated, or under other stressful circumstances, some gels or fluids that are thick (viscous) under static conditions will flow (become thin, less viscous) over time.
Peptization is the process by which an electrolyte disperses a recently precipitated substance into a colloidal solution.
Imbibition is the process by which a solid or gel absorbs a liquid.