Alcohol content
If I let a glass of beer warm to room temp, and the use the hydrometer will it tell me what % the beer is? I had someone ask me after I gave them a bottle.

Nope. For that they would have to take a gravity reading before fermentation as well.

The alcohol scale on a hydrometer is for "potential alcohol" and does not equal the actual alcohol level in a beer.
To calculate the alcohol by volume of a beer is an equation using the Original Gravity and Final Gravity. I do not know what the equation is, I just plug the numbers into an online calculator. Without the OG or sophisticated lab equipment you can not tell. 
Here's the Cooper's formula I use; (OGFG)/7.46 +.5= ABV%. If you kept notes,you can quickly figure it out with the windows calculator.

ogfg x 131

Not tryin to stir things up again from last year,but the beer/kummel/buttershots demands it. :drunk: I noticed some 8 different formulas that all give different results. I guess a brewer should use the one his buzzed nurons say is right...:tank:

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For instance, a beer that finished at 1.012, if you assume 72% attenuation, OG would be 1.043, for an ABV of 4. But if the attenuation was really 65%, then OG is 1.034 and ABV is 2.9. On the other hand, if the attenuation was 80%, then OG was 1.060 and ABV was 6.3%. Now, get yourself a liquid cromatograph or something like that and you'll be in business. ;) 
Revvy's is the formula I have always seen.
The Coopers formula makes everything 5% or more. Take 1.000 water, ferment and it is still 1.000 water. Divide by 7 and it is still zero. Then add .5. That doesn't make any sense. 
Not in my experience. I've used their formula & got 4.5% as well.

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