My volume went up 2 liters!?! - Home Brew Forums

 Home Brew Forums > My volume went up 2 liters!?!

01-24-2010, 10:54 PM   #1
Setesh

Recipes

Dec 2009
Oklahoma City, Oklahoma
Posts: 1,463
Liked 343 Times on 240 Posts

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.

01-24-2010, 11:31 PM   #2
GroosBrewz

Recipes

Sep 2008
West Richland, WA, WA
Posts: 817
Liked 8 Times on 8 Posts

Quote:
 Originally Posted by Setesh 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....
__________________
Tap 1- JubelAle Clone
Tap 2- Evening Bite Pale Ale
Tap 3- Twilight Clone
Tap 4- Dicks Danger Ale Clone

"Today I felt like burning some calories....So I found a fat kid and set him on fire"

01-25-2010, 12:09 AM   #3
JeffersonJ

Recipes

Dec 2009
Durham, NC
Posts: 164
Liked 7 Times on 7 Posts

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.

01-25-2010, 01:05 AM   #4
Setesh

Recipes

Dec 2009
Oklahoma City, Oklahoma
Posts: 1,463
Liked 343 Times on 240 Posts

Quote:
 Originally Posted by JeffersonJ 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.
Brewing is so neat!

01-25-2010, 01:07 AM   #5
Setesh

Recipes

Dec 2009
Oklahoma City, Oklahoma
Posts: 1,463
Liked 343 Times on 240 Posts

Quote:
 Originally Posted by GroosBrewz 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