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12 years 10 months ago #31

heres what HMRC[/url:8303w6lk]have to say on how to calculate ABV. The factor is dependent on the strength.

I have seen about 3 different values shown in different place, 131,133,136.Think the above gives the definitive version if you can bothered.

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12 years 10 months ago #32

Which one gives me the strongest beer? <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->

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12 years 10 months ago #33

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!!
[/quote:1zyhu10u]

By the time you factor in errors in your hydrometer readings I reckon being only 0.2% out would be pretty good.

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12 years 10 months ago #34

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:36gfz819]
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!!

If we're talking gravities then we should add [b:36gfz819]attenuation[/b:36gfz819] as an entry. It's divided into real and apparent.
[b:36gfz819]Apparent attenuation[/b:36gfz819] 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:36gfz819]Real attenuation[/b:36gfz819] 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:36gfz819]
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:) -->[/quote:36gfz819]

You have to take the whole number values for the 0.136 figure to work: 36 for 1.036.

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