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saponification value
represents the number of milligrams of potassium hydroxide required to sapoonify 1g of fat under the conditions specified. It is a measure of the average molecular weight (or chain length) of all the fatty acids present. As most of the mass of a fat/tri-ester is in the 3 fatty acids, it allows for comparison of the average fatty acid chain length.
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Saponification value is expressed or convey by potassium hydroxide in milligram which is widely needed to saponify (which creates a soapy structure) 1 gram of fat.