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A gel is a solid jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinking within the fluid that gives a gel its structure and contributes to the adhesive stick . In this way gels are a dispersion of molecules of a liquid within a solid in which liquid particles are dispersed in the solid medium . The word gel was coined by 19th-century Scottish chemist Thomas Graham by clipping from gelatine.