iodine number

noun

variants or iodine value

: a measure of the unsaturation of a substance (as an oil or fat) expressed as the number of grams of iodine or equivalent halogen absorbed by 100 grams of the substance

the iodine numbers of linseed oil, olive oil, and coconut oil are approximately 175–201, 77–91, and 8–9.5 respectively

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