Woodsa
Member
Can anyone tell me what causes negative/vaccuum pressure in airlock after wort has been in fermenter for seven days & finished fermenting.
Negative Pressure
- Thread starter Woodsa
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Kayos
Well-Known Member
Can you give a backstory?
Did you get a large swing in temperature? That will cause a pressure change that could do that.
Simple... active fermentation produces a lot of heat. It can raise your wort 5 degrees above ambient. Once it ends, it begins to cool down to ambient. Cold gas takes up less space than warm gas, thus the shrinkage/vaccuum.
Must be part of the problems I've noticed lately with my S-type airlocks. Topping them off twice a day, and they still were turning up empty. I've switched to the other type, and they stay full without a problem.
Woodsa
Member
Thanks guys I do believe it may have been a temp problem as you suggested
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