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where OG is the original gravity, or the specific gravity before fermentation and FG is the final gravity or SG after fermentation. "Original Extract" (OE) is a synonym for original gravity. The OE is often referred to as the "size" of the beer and is, in Germany, often printed on the label as Stammwürze or sometimes just as a percent. In the ...
Many beer styles are classified as one of two main types, ales and lagers, though certain styles may not be easily sorted into either category.Beers classified as ales are typically made with yeasts that ferment at warmer temperatures, usually between 15.5 and 24 °C (60 and 75 °F), and form a layer of foam on the surface of the fermenting beer, thus they are called top-fermenting yeasts.
The pressure is always considered (in brewing) to be 1 standard atmosphere (1,013.25 hPa) and the temperature is usually 20 °C (68 °F) for both sample and water but in some parts of the world different temperatures may be used and there are hydrometers sold calibrated to, for example, 16 °C (60 °F).
Pilsner (also pilsener or simply pils) is a type of pale lager. It takes its name from the Bohemian city of Plzeň ( German : Pilsen ), where the world's first pale lager (now known as Pilsner Urquell ) was produced in 1842 by Pilsner Urquell Brewery .
Altbier is usually a dark, copper colour. It is fermented at a moderate temperature using a top-fermenting yeast—which gives its flavour some fruitiness. Because Altbier is then matured at a cooler temperature, its flavour is more akin to lager beer styles than is the norm for top-fermented beers (such as British pale ale).
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 ...
The flavor of beer is influenced by the strain of yeast and the fermentation temperature. Lager yeast is best used at temperatures from 48 to 58 °F (9 to 14 °C). Classic lagering of beers takes place over a period of time from weeks to many months at a temperature of 37 °F (3 °C).
Because of the closeness in temperatures of peak activity of an α-amylase (63-70 °C) and β-amylase (55-65 °C), the two rests are often performed at once with the time and temperature of the rest determining the ratio of fermentable to non-fermentable sugars in the wort and, hence, the final sweetness of the fermented drink.