Carbon Dioxide [CO2] The gaseous by-product of yeast. Carbon dioxide is what gives beer its carbonation (bubbles). Related Articles: Glossary: Въглероден диоксид (CO2)« Back to Glossary IndexRelated Terms:Term: Carbon DioxideTerm: CarbonationTerm: Yeast Стоян Нинов2021-11-01T09:20:55+02:00