Outgassing vs. Fermentation - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Outgassing vs. Fermentation

Reply
 
Thread Tools
Old 04-08-2009, 08:03 PM   #1
Schnitzengiggle
 
Schnitzengiggle's Avatar
Recipes 
 
Feb 2009
Tucson, AZ
Posts: 2,560
Liked 31 Times on 23 Posts



I have a primary that has had airlock activity for over 3 weeks. What is the difference between outgassing and fermentation, and how long can outgassing occur after fermentation is finished?
__________________
follow me @ Broken Glass Brewery

Okham's Razor - simplest explanation is usually the correct one.

My DIY Kegerator - My DIY Fermentation Chamber - My DIY Portable Pump Box

 
Reply With Quote
Old 04-08-2009, 08:06 PM   #2
bradsul
Flyfisherman/brewer
HBT_LIFETIMESUPPORTER.png
 
bradsul's Avatar
Recipes 
 
Sep 2006
Ontario, Canada
Posts: 4,898
Liked 32 Times on 25 Posts


Only your hydrometer knows the difference. Once the reading is the same for 3 days in a row it's finished fermentation and just outgassing. At three weeks I'd guess fermentation is most likely finished.
__________________
Brad
Canadian Brewers Unite!


Projects: Sylvania Kegerator Conversion, Tower Cooling, Grain Milling Station

 
Reply With Quote
Old 04-08-2009, 09:16 PM   #3
ArcaneXor
 
ArcaneXor's Avatar
Recipes 
 
Nov 2007
Posts: 4,572
Liked 117 Times on 104 Posts


If you have a carboy or Better Bottle, it's easy to tell - shine a flashlight in there and see where the bubbles originate. If they all come from the yeast bed, you've got fermentation (or, at least, organic activity - anaerobic breakdown of organic matter can also release gases unrelated to fermentation). If the bubbles originate from the walls of the carboy well above the yeast bed, you've got outgassing.

As long as your expected final gravity has been reached and has remained stable for a week or so, you can convince those last, persistent yeast to quit by cold crashing.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fermentation cooler vs refrigerator vs son of fermentation Belmont General Techniques 18 08-15-2015 05:54 PM
Wine fermentation vs beer fermentation Tophe Winemaking Forum 4 11-19-2010 07:38 PM
Which is better? A fast, very active fermentation, or a slow steady fermentation? cerberus9 Beginners Beer Brewing Forum 6 09-24-2009 04:56 PM
Lager outgassing HotbreakHotel Fermentation & Yeast 4 09-04-2009 10:45 AM
Imperial stout still outgassing or infected? gyoder Fermentation & Yeast 1 08-11-2009 01:32 AM


Forum Jump