International Bitterness Units [IBU]

International Bitterness Units are the measure of isohumulone in parts per million (ppm) of beer and are the main chemical compounds derived from hops that make beer bitter.  This measurement is very useful for checking the consistency between batches of beer, but it does little for predetermining how bitter a beer will taste. A better method for determining how bitter a beer will taste is to use the bitterness ratio.

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