---
title: Acid Number
description: A test using potassium hydroxide as the neutralizing agent to measure the acidity of an oil. The result is measured in milligrams of potassium hydroxide needed to neutralize one gram of oil.
---

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# Acid Number

A test using potassium hydroxide as the neutralizing agent to measure the **acidity** of an oil. The result is measured in milligrams of potassium hydroxide needed to neutralize one gram of oil.

 

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