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