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The diagrams show how detergent removes oil droplets often contained in dirt. When the detergent dissolves in water, detergent molecules group themselves around an oil droplet (a). The water-repelling part of the molecules (light area) projects into the droplet, while the water-soluble part (dark area) remains in the water (b). The oil is held in suspension by the emulsifying action of the detergent and is carried away with the dirty water (c). steps in the manufacture of synthetic detergents
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The diagrams show how detergent removes oil droplets often contained in dirt. When the detergent dissolves in water, detergent molecules group themselves around an oil droplet (a). The water-repelling part of the molecules (light area) projects into the droplet, while the water-soluble part (dark area) remains in the water (b). The oil is held in suspension by the emulsifying action of the detergent and is carried away with the dirty water (c).
The diagrams show how detergent removes oil droplets often contained in dirt. When the detergent dissolves in water, detergent molecules group themselves around an oil droplet (a). The water-repelling part of the molecules (light area) projects into the droplet, while the water-soluble part (dark area) remains in the water (b). The oil is held in suspension by the emulsifying action of the detergent and is carried away with the dirty water (c).

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William Hesketh Lever

detergent, any of various surfactants (surface-active agents) particularly effective in dislodging foreign matter from soiled surfaces and retaining it in suspension. The term usually denotes a synthetic substance that is not prepared by saponifying fats and oils (as is soap).

A brief treatment of detergents follows. For full treatment, see soap and detergent.

Dishwashing and laundering of clothing are the principal applications of detergents for which the liquid bath is water. Detergents also are used as emulsifiers in many applications. Detergents that function in nonaqueous media include dispersing agents added to lubricating oils used in automotive engines to prevent the accumulation of varnishlike deposits on the cylinder walls, to gasoline to prevent the buildup of gummy residues in the carburetor, and to dry-cleaning solvents to facilitate the removal of soil from garments.

This article was most recently revised and updated by Erik Gregersen.