Ask Mr. Wizard How do hops affect the final gravity of a beer? Q How do hops affect the final gravity of a beer? I recently brewed a new England IPA with 12 ounces of hops for 5 gallons (19 l). The final gravity was 1.018 and i expected 1.014 with the Gigayeast Vermont IPA yeast. So to me it tastes stronger than the 5.5% ABV that i calculated, and i don't understand why the hop content Doesn't make the hydrometer float higher. A Hops do not have a significant impact on wort or beer density because the concentration of hop soluble compounds is simply too low to make much of an impact on density. In order to increase the density of 1 liter of wort by 1 ˚Plato, 0.01 kg or 10,000 mg of soluble solids must be added. A beer that contains 100 mg of iso-alpha-acids per liter of beer (100 IBUs) adds sufficient "extract" to boost the gravity by 0.1 ˚Plato, which is within the error range of the typical brewery hydrometer. Hops do lend compounds to beer other than iso-alpha-acids, such as non-isomerized alpha acids, beta acids, and hop oils, but these are minor players in comparison to the iso-alpha-acids. Read more |
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