Alcohol Fermentation
Fermentation of grape juice into wine produces CO2 as a byproduct. Fermentation tanks have valves so that the pressure inside the tanks created by the carbon dioxide produced can be released.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Metabolism Without Oxygen. October 16, 2013."
http://cnx.org/content/m44444/latest/Figure_07_05_03.jpg
OpenStax CNX
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