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"Atticus":3f1cr7oo wrote: Is 131 not used on one of the tutorials?[/quote:3f1cr7oo]

Which one?

"Atticus":1lfvca7u wrote: Just checked there, it's the Kit Brewing one.
I'd been using the 131 from seeing it there. I'd imagine a lot of newbies like mysef have been too.[/quote:1lfvca7u]

I see it.

[quote:1lfvca7u](1.045-1.009)X131= Alcohol by Volume.

0.036X131=Alcohol by Volume.

4.716=Alcohol by Volume. [/quote:1lfvca7u]

The confusion is in the difference between 0.036 and 36. My method takes a whole number while Sean's takes the decimal places. The result is essentially the same give or take a bit. We should settle on a method perhaps, but both work.

"Hendrixcat":3fjwpmpu wrote: I don't think that value of 131 is correct. It should be approximately 0.136. Multiplying by 131 doesn't make any sense. For example if you had an OG of 1.060 and FG of 1.015 this would give an ABV of 6.1% using the 0.136 figure. The 131 figure doesn't work.[/quote:3fjwpmpu]
Sorry Thom, but I cant seem to get .136 to work
From your example (1.06-1.015)*.136 = .00612
Assuming this is the ratio and multiplying by 100 (to express the ratio as a %) give me .612 %ABV.
The same eg using 131: (1.06-1.015)*131 = 5.895
Im probably missing something... <!-- s:? --><img src="{SMILIES_PATH}/icon_confused.gif" alt="" title="Confused" /><!-- s:? -->
I have to say Im surprised by the difference in the calculation methods - 5.9 V 6.1 is more of a difference than I expected!!

&amp;quot;Hendrixcat&amp;quot;:3fjwpmpu wrote: If we're talking gravities then we should add [b:3fjwpmpu]attenuation[/b:3fjwpmpu] as an entry. It's divided into real and apparent.
[b:3fjwpmpu]Apparent attenuation[/b:3fjwpmpu] is the the amount of sugar fermented and corresponds to the percentage of OG removed during fermentation. For example OG = 1.040 and FG = 1.010 then apparent attenuation = 30/40 x 100 = 75%.
[b:3fjwpmpu]Real attenuation[/b:3fjwpmpu] is the apparent attenuation corrected by a factor of 0.82, taking into account the differing density of the ethanol present in the beer, which causes the hydrometer to sink further into the beer.[/quote:3fjwpmpu]
I'm glad I started the ball rolling, seeing at it means I get to learn stuff <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s:) -->