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working out ABV
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Lorrainelovesplants



Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
PostPosted: Wed Feb 05, 14 11:44 am    Post subject: working out ABV Reply with quote
    

Okay...
having a maths argument with John.

How to calculate ABV...

If I have 20L of 10.92% and 20L of 8.3% and I mix them together, what is the ABV of the 40L?
I make it 9.17%, but he insists that this is wrong as I have to work out the average differently.....

anyone?

Rob R



Joined: 28 Oct 2004
Posts: 31902
Location: York
PostPosted: Wed Feb 05, 14 11:51 am    Post subject: Reply with quote
    

I make it to be 9.61%

joanne



Joined: 28 Oct 2004
Posts: 7100
Location: Morecambe, Lancashire
PostPosted: Wed Feb 05, 14 11:53 am    Post subject: Reply with quote
    

I make it 9.61% as well - add the two together & divide by 2 to get the ABV

sean
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 42207
Location: North Devon
PostPosted: Wed Feb 05, 14 11:55 am    Post subject: Reply with quote
    

What they said. How did you get to your answer?

dpack



Joined: 02 Jul 2005
Posts: 45321
Location: yes
PostPosted: Wed Feb 05, 14 12:02 pm    Post subject: Reply with quote
    

20l at 10.92=218.4gm

20 at 8.3=116gm

so 384.4gm in 40l=9.61 %

MAYBE?

dpack



Joined: 02 Jul 2005
Posts: 45321
Location: yes
PostPosted: Wed Feb 05, 14 12:12 pm    Post subject: Reply with quote
    

tis a wt/volume calculation

Lorrainelovesplants



Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
PostPosted: Wed Feb 05, 14 12:24 pm    Post subject: Reply with quote
    

okay, Ill suggest its 9.61%, so as its quite high I could dilute down to around 6% by adding 20L water/juice?

This would make a total volume of 80L...



(yes, my maths is shite)

Bodger



Joined: 23 May 2006
Posts: 13524

PostPosted: Wed Feb 05, 14 2:04 pm    Post subject: Reply with quote
    

Did you put sugar in with the apple juice before fermentation to get such a high reading?

Lorrainelovesplants



Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
PostPosted: Wed Feb 05, 14 2:20 pm    Post subject: Reply with quote
    

nope - all pure apple.

My local small cider professional says to dilute half water and half juice, but Ill need to pasteurise it all or it will start again.

and Ive just been given some redundant plastic 20L polypins, so I need to see how I can use these....

Bodger



Joined: 23 May 2006
Posts: 13524

PostPosted: Wed Feb 05, 14 2:32 pm    Post subject: Reply with quote
    

We've found that cider of no more than 5% sells the best. Anything more than that and the majority of punters tend to look at it a bit suspiciously. That reading of 10% is hellishly high for a cider that hasn't had sugar added to it.

dpack



Joined: 02 Jul 2005
Posts: 45321
Location: yes
PostPosted: Wed Feb 05, 14 2:44 pm    Post subject: Reply with quote
    

it might be interesting to try some

Lorrainelovesplants



Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
PostPosted: Wed Feb 05, 14 2:45 pm    Post subject: Reply with quote
    

The two pressings we did -
first one (a mix of apples, mainly eaters) 1063
second one (ciders with loads of Cornish Aromatic) 1083.
Remember weve had a really good hot summer.

Bodger, the plastic cap/bung things on the top of a beer polypin (a plastic one, not a bag in box) what is it called? The bit that the pub screws into?

Bodger



Joined: 23 May 2006
Posts: 13524

PostPosted: Wed Feb 05, 14 3:04 pm    Post subject: Reply with quote
    

If you mean poly barrel, I only know it as a top or cap.

Lorrainelovesplants



Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
PostPosted: Wed Feb 05, 14 4:16 pm    Post subject: Reply with quote
    

Just found out - its a keystone bung and they are not going to be good for storing finished cider, but could use for fermenting in small quantities.

fungi2bwith



Joined: 08 Nov 2007
Posts: 167
Location: NE Hants
PostPosted: Wed Feb 05, 14 5:57 pm    Post subject: Re: working out ABV Reply with quote
    

Lorrainelovesplants wrote:
Okay...
having a maths argument with John.

How to calculate ABV...

If I have 20L of 10.92% and 20L of 8.3% and I mix them together, what is the ABV of the 40L?
I make it 9.17%, but he insists that this is wrong as I have to work out the average differently.....

anyone?


To get the exact answer, it should be pointed out that the question makes an incorrect assumption. Mixing two lots 20 litre liquids together which have different alcohol contents will not result in exactly 40 litres of liquid. Therefore, a simple average (mean) of the percentages will not give the correct result.
However, the difference will be minor and very difficult to calculate.

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