Air Lock
De Wikignôle.
A glass or plastic device designed to use water as an insulator to protect the fermentation media from contamination and exposure to fresh air, while at the same time allowing carbon dioxide produced by the yeast to escape the fermentation vessel. Also called a fermentation trap, bubbler or airlock. Perhaps the simplest airlock often used by amateur brewers is a common party balloon that has a pinprick hole to allow CO2 to escape. Another easy method for amateurs is simply a tube with its end submerged in water.Fichier:Bubbler.gif
Airlock in action
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A commercial airlock
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A cylinder airlock
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An S-curve airlock
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cylinder airlock in action
