ArticleThe Science of Yeast The layman's guide to the science of brewer's yeast.Already a member? Log InWritten by BYO StaffYou'll Also Like Article MEMBERS ONLY Diastaticus The layman's guide to the science of brewer's yeast. Already a member? Log In Article MEMBERS ONLY The Role of pH in Brewing pH plays a role in every step of the brewing process — from the time you mash in, all the way through to the final beer that fills the glass. Take a closer look at pH throughout the brewing process.