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The original gravity is the specific gravity measured before fermentation. From it the analyst can compute the original extract which is the mass (grams) of sugar in 100 grams (3.5 oz) of wort (°P) by use of the Plato scale. The symbol will denote OE in the formulas which follow.
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 ...
A more attenuated beer is drier and more alcoholic than a less attenuated beer made from the same wort. Attenuation can be quantified by comparing the specific gravity — the density of a solution, relative to pure water — of the extract before and after fermentation, quantities termed the original and final gravities.
Specific gravity is the density of a liquid relative to that of water, i.e., if the density of the liquid is 1.05 times that of water, it has a specific gravity of 1.05. In UK brewing usage, it is customary to regard the reference value for water to be 1000, so the specific gravity of the same example beer would be quoted as 1050.
style – Beer style. og – Original gravity. fg – Final gravity. ibu – International Bitterness Units scale. manufacturer – The main manufacturer. distributor – If the distributor is not also the manufacturer. origin – Country of first introduction or origin.
Common measurements of 10° or 12° would be equivalent to 1040 or 1048 in the English "original gravity" scale. A common misconception is that this is a measure of the colour of the beer. Since the fall of communism, most large commercial breweries were privatized and subsequently bought by foreign multinational companies.
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Early London porters were strong beers by modern standards. Early trials with the hydrometer in the 1770s recorded porter as having an original gravity (OG) of 1.071 and 6.6% alcohol by volume (ABV). [15] Increased taxation during the Napoleonic Wars pushed its gravity down to around 1.055, where it remained for the rest of the 19th century ...