A semi-solid substance with liquid trapped within a solid network structure. Used in various contexts from cosmetics to scientific applications.
From Latin 'gelare' meaning 'to freeze' via French 'gelée.' Originally referred to jellied substances, with the modern scientific sense of colloidal systems developing in the early 20th century.
Gels are fascinating because they act like solids but are mostly liquid - some gels are over 99% water yet maintain their shape. The word family includes 'gelatin,' 'jelly,' and even 'congeal,' all relating to this magical transformation from liquid to semi-solid.
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