acid number

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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Also called acid value.

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Acid number is always a great word to know.

So is unstable. Does it mean:

noting compounds that readily decompose or change into other compounds

a reaction in which two or more substances combine to form another compound

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