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    Good answer, but I'd like to add a caveat to "Airlock bubbles do indicate active fermentation." The airlock can continue to bubble after fermentation has finished due to off-gassing. The active fermentation filled the beer with CO2, and the CO2 will continue to come out of solution for quite some time after fermentation has finished. So airlock activity tells you that fermentation is taking place or has already taken place. It isn't necessarily still active.
    – JackSmith
    Commented Jan 18, 2012 at 21:31
  • A good point, thanks @Jack. I guess I was over-simplifying.
    – JoeFish
    Commented Jan 18, 2012 at 21:50
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    Indeed. As a beer warms, the amount of C02 that can stay in suspension in the liquid decreases, thus producing bubbles in the airlock. A lot of people rack to secondary and see bubbles from the off-gassing and assume fermentation has started again.
    – GHP
    Commented Jan 19, 2012 at 14:13
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    Relax and have a homebrew. Great response Joe
    – gnome
    Commented Jan 19, 2012 at 19:11