greenbirds
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- May 15, 2008
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In 70+ batches I have never seen this happen.
My Scottish 80 Shilling finished fermenting 2 weeks ago (confirmed by hydrometer, tasting, and dropped crystal clear). It has been bubbling slowly and steadily since, what I assumed was CO2 degassing. It has been at 77 F the entire time. The beer was racked from primary to secondary after about 3 weeks and dropped about 1 gravity point (1.016 to 1.015, the same gravity as my forced ferment test) during that secondary. The carboy was filled all the way to the neck.
Today for kicks I stuck my Reynolds Handi-Vac on the airlock mouth to see what would happen when I pulled a vacuum. A few seconds later, a rush of CO2 evolved from the beer and created a beer volcano out the the top of the carboy!
Here is a video of me doing this for the 4th and 5th times -- might want to turn your volume down, the pump sound is obnoxious.
I have now performed this 8 or 10 times, and I'm still getting a rush of CO2. I cut the vacuum as soon as I see it to avoid the ensuing volcano.
My question isn't why there's a volcano, it's why this particular batch has so much CO2 dissolved in it at room temp. My only guess is it's saturated, and with such small surface area in the carboy neck, the CO2 hasn't been "motivated" (for lack of a better term) to evolve on its own. But this doesn't seem like a great explanation to me.
My Scottish 80 Shilling finished fermenting 2 weeks ago (confirmed by hydrometer, tasting, and dropped crystal clear). It has been bubbling slowly and steadily since, what I assumed was CO2 degassing. It has been at 77 F the entire time. The beer was racked from primary to secondary after about 3 weeks and dropped about 1 gravity point (1.016 to 1.015, the same gravity as my forced ferment test) during that secondary. The carboy was filled all the way to the neck.
Today for kicks I stuck my Reynolds Handi-Vac on the airlock mouth to see what would happen when I pulled a vacuum. A few seconds later, a rush of CO2 evolved from the beer and created a beer volcano out the the top of the carboy!
Here is a video of me doing this for the 4th and 5th times -- might want to turn your volume down, the pump sound is obnoxious.
I have now performed this 8 or 10 times, and I'm still getting a rush of CO2. I cut the vacuum as soon as I see it to avoid the ensuing volcano.
My question isn't why there's a volcano, it's why this particular batch has so much CO2 dissolved in it at room temp. My only guess is it's saturated, and with such small surface area in the carboy neck, the CO2 hasn't been "motivated" (for lack of a better term) to evolve on its own. But this doesn't seem like a great explanation to me.
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