Gel

A gel is a semi-solid substance material which usually wobbles.

By weight, gels are mostly liquid. But gels also behave like solids. They have a three-dimensional cross-linked network within the liquid. It is the crosslinks in the fluid that give a gel its structure.

As colloids, gels are a dispersion of molecules of a liquid within a solid. In a gel, the solid is the continuous phase; the liquid is the discontinuous phase.

Examples: Jellies, agar, contact lenses, organic slime.

Gel Media

• 

  Hair gel in an upturned vial

• 

  silica gel

• 

  Hydrogel of a superabsorbent polymer