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-   -   My volume went up 2 liters!?! (http://www.homebrewtalk.com/f39/my-volume-went-up-2-liters-159016/)

 Setesh 01-24-2010 09:54 PM

My volume went up 2 liters!?!

Hello,

This is my fifth batch of beer, and it is a big Belgian Quad. OG was 1102. I topped up to 19 liters in the primary and pitched 2 vials of WLP500. Fermentation is complete now (FG 1024) and it is conditioning. What I don't understand is now the volume reads 21 liters. Is this because those yeasties multiplied enough to take up 2 more liters in volume? If so, that's a lot of yeasties.

 GroosBrewz 01-24-2010 10:31 PM

Quote:
 Originally Posted by Setesh (Post 1834156) Hello, This is my fifth batch of beer, and it is a big Belgian Quad. OG was 1102. I topped up to 19 liters in the primary and pitched 2 vials of WLP500. Fermentation is complete now (FG 1024) and it is conditioning. What I don't understand is now the volume reads 21 liters. Is this because those yeasties multiplied enough to take up 2 more liters in volume? If so, that's a lot of yeasties.

Actually, that sounds about right for a beer that big.... :)

 JeffersonJ 01-24-2010 11:09 PM

Well, the density of water is 1 kg/liter...

An OG of 1.102 means your original density is 1.102 kg/liter. You said it was 19 liters, so your mass is

( 1.102 kg/liter ) * (19 liters) = 20.94 kg

During fermentation, your mass is pretty much constant. So if the density decreases and the mass stays the same, then the volume must increase. So with an FG of 1.024, your density is 1.024 kg/liter. Then, your final volume is:

( 20.94 kg ) / (1.024 kg/liter) = 20.45 liters

( 20.45 liters ) - ( 19 liters) = 1.45 liters

So, you should expect an increase of about 1.5 liters during fermentation of such a large beer.

 Setesh 01-25-2010 12:05 AM

Quote:
 Originally Posted by JeffersonJ (Post 1834279) Well, the density of water is 1 kg/liter... An OG of 1.102 means your original density is 1.102 kg/liter. You said it was 19 liters, so your mass is ( 1.102 kg/liter ) * (19 liters) = 20.94 kg During fermentation, your mass is pretty much constant. So if the density decreases and the mass stays the same, then the volume must increase. So with an FG of 1.024, your density is 1.024 kg/liter. Then, your final volume is: ( 20.94 kg ) / (1.024 kg/liter) = 20.45 liters Your increase in volume: ( 20.45 liters ) - ( 19 liters) = 1.45 liters So, you should expect an increase of about 1.5 liters during fermentation of such a large beer.
Thanks JeffersonJ, it makes perfect sense when you think of it that way. :mug:
Brewing is so neat!

 Setesh 01-25-2010 12:07 AM

Quote:
 Originally Posted by GroosBrewz (Post 1834227) Actually, that sounds about right for a beer that big.... :)
Thanks!
I'm sure it's something I would have learned with experience, but I was curious NOW :)

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