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Dear Abdulrehman,
When a species of long polymers are cross-linked into a three-dimensional network, the resulting material, known as an elastomer, is capable of large elastic deformation. Another species of molecules, of a low molecular weight, and capable of weak bonding with one another and with the polymers, can act as a solvent. When the elastomer is immersed in the solvent, the small molecules diffuse into the interstitial space of the network. The cross links in the network prevent the polymers from dissolving; rather, the network swells. The aggregate of the swollen network and the small molecules is called a gel. As the small molecules diffuse in and out, the gel swells and shrinks reversibly.
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