[b:31wcdv2w]Alcohol By Volume (ABV)[/b:31wcdv2w] – a standard measure of how much alcohol is contained in an alcoholic beverage. It is expressed as a percentage of total volume and can be calculated as follows;
[b:31wcdv2w]ABV = (OG - FG) X 131 [/b:31wcdv2w]
where
[b:31wcdv2w]OG = Original Gravity [/b:31wcdv2w]
[b:31wcdv2w]FG = Final Gravity [/b:31wcdv2w]
Of course, now I have to define Original Gravity, Final Gravity, and Specific Gravity <!-- s:roll: --><img src="{SMILIES_PATH}/icon_rolleyes.gif" alt="

" title="Rolling Eyes" /><!-- s:roll: -->
[b:31wcdv2w]Specific Gravity[/b:31wcdv2w] - the ratio of the density of liquid to the density water. This is normally measured by brewers twice (see [b:31wcdv2w]OG[/b:31wcdv2w] and [b:31wcdv2w]FG[/b:31wcdv2w]) to calcuale the [b:31wcdv2w]ABV[/b:31wcdv2w]. Measuring the Specific Gravity using a standard brewing [b:31wcdv2w]hydrometer[/b:31wcdv2w] should be carried out at 15 degrees Celcius (60F)
[b:31wcdv2w]Original Gravity[/b:31wcdv2w] - The [b:31wcdv2w]specific gravity[/b:31wcdv2w] of wort taken just before the yeast is added
[b:31wcdv2w]Final Gravity[/b:31wcdv2w] - The [b:31wcdv2w]specific gravity[/b:31wcdv2w] of beer taken just before the beer is moved from the fermenter to the bottle or keg.
I can see how putting the whole list together must have been a pain!! <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt="

" title="Smile" /><!-- s:) -->