acid number

American

noun

Chemistry.

a number expressing the acidity of a substance, equal to the number of milligrams of potassium hydroxide needed to neutralize the free fatty acids present in one gram of the substance.

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acid number

For a more exact expression of the free acid in a given fat, the committee recommends that the ratio of acid number to saponification number be used.

From Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. by E. G. Thomssen

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023