salt of fatty acids (long-chain carboxylic acids), used for washing and cleaning
In chemistry, a soap is a salt of a fatty acid. Household uses for soaps include washing, bathing, and other types of housekeeping, where soaps act as surfactants, emulsifying oils to enable them to be carried away by water.
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- Soap manufacture flourished in Europe from the eighth century onward in such towns as Castilla in Spain, Marseilles in France, and Savona in Italy.
- Catherine Failor (12 November 2012). Making Transparent Soap: The Art Of Crafting, Molding, Scenting & Coloring. Storey Publishing, LLC. p. 2. ISBN 978-1-61212-262-5.