Why is it forbidden to drink beer on pesach. First of all beer isn't in the form of a solid food so it can't be "leavening". Second the only time we describe the prohibition of food with an amount is Yom Kippur, reguarding wether it's one or two cheek fulls. If beer or other fermented grains are forbidden then what is the amount to be חייב כרת.
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Actually the answer to your question is implied in your question. Your are consuming fermented grains which is the definition of chametz. Just because you then dissolve the fermented grain in a liquid does not make it permissible. The "cheekful" reference is for liquid food, as is the reference to Rvi'is.
A good summary WHICH FOODS ARE CHAMETZ? is:
Most beer produced today is produced from barley. The barley is soaked in water to malt. Barley is one of the 5 major grains which become Chometz by exposure to water. Regarding the amount of Chometz that is forbidden, Chometz is forbidden B'Mashehu (even a minute amount). However there are grain-free beers that are Kosher for Pesach.