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Boil
The obvious definition is bringing a liquid to a high enough temperature that it begins to evaporate. With regards to brewing, boiling causes isomerization (changing of the structure of molecules) of the alpha and beta bittering acids from hops which makes them water soluble. The longer hops are boiled (up to 75 minutes or so), the more isomerization occurs, and the more hop bitterness will be present in your beer.
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