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Knowing the amount of extract in 100 grams (3.5 oz) of wort before fermentation and the number of grams of extract in 100 grams (3.5 oz) of beer at its completion, the amount alcohol (in grams) formed during the fermentation can be determined. The formula follows, attributed to Balling [1]: 427
A 16th-century brewery Brewing is the production of beer by steeping a starch source (commonly cereal grains, the most popular of which is barley) in water and fermenting the resulting sweet liquid with yeast. It may be done in a brewery by a commercial brewer, at home by a homebrewer, or communally. Brewing has taken place since around the 6th millennium BC, and archaeological evidence ...
A hotter rest results in a fuller-bodied, sweeter beer as α-amylase produces more non-fermentable sugars. 66 °C (151 °F) is a typical rest temperature for a pale ale or German pilsener, while Bohemian pilsener and mild ale are typically rested at 67–68 °C (153–154 °F).
The dropping process has two primary effects on the beer being fermented: the trub that has settled during the first period of fermentation will be left behind, leaving a cleaner beer and a cleaner yeast to crop from the beer for the next fermentation; the second effect is the aeration of the wort, which results in healthy clean yeast growth ...
Once the wort has cooled to a temperature that is friendly to yeast, the yeast is "pitched" into the wort and allowed to ferment. It is at this point that 'wort" becomes "beer." Primary fermentation in homebrewing takes place in large glass or plastic carboys or food-grade plastic buckets, nearly always sealed. [60]
Top-fermenting yeasts are fermented at higher temperatures than the lager yeast Saccharomyces pastorianus, and the resulting beers have a different flavor from the same beverage fermented with a lager yeast. "Fruity esters" may be formed if the yeast undergoes temperatures near 21 °C (70 °F), or if the fermentation temperature of the beverage ...
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Modern ale is typically fermented at temperatures between 15 and 24 °C (59 and 75 °F). At temperatures above 24 °C (75 °F) the yeast can produce significant amounts of esters and other secondary flavor and aroma products, and the result is often a beer with slightly "fruity" compounds resembling those found in fruits, such as apple, pear ...