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Specific gravity

318 bytes added, 21:31, 25 July 2006
'''Specific Gravity (SG)''' is a measure of the relative density of one material compared to another. For brewing, the reference material is water, so the specific gravity of [[wort]] or beer is simply the density of the liquid divided by the density of water. This results in a dimensionless number, which by brewing convention is usually listed to three decimal places. For example, water would have a specific gravity of 1.000, while an unfermented wort might have a specific gravity of 1.048. Finished beer would typically have a specific gravity in the 1.005-1.015 range. The specific gravity measure is somewhat ambiguous, since the density of water does vary with temperature, but by convention specific gravity in brewing is typically measured by a [[hydrometer]] calibrated to 60 F. Specific gravity is typically measured at several points during the [[processes|brewing process]] - after [[sparging]], before [[fermentation]] and after fermentation. The gravity measured before fermentation is called the [[Original Gravity]] and the measurement after fermentation is called the [[Final Gravity]].
==See Also==