The stage in the brewing process where yeast is pitched into the wort and the bulk of the sugars are converted to alcohol, transforming the wort into beer. Contrasts with secondary fermentation, bottle fermentation (bottle conditioning) and aging.

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Not seeing fermentation on lager's primary fermentation

We're currently trying to get a lager to go through its primary fermentation but after 2 days, we haven't seen any action or changes on the surface of the wort. The wort had a full packet of yeast ...