The gas used in the production of fizzy drinks is carbon dioxide (CO2). This colorless and odorless gas is dissolved under pressure in beverages to create carbonation, which produces the characteristic fizz. When the pressure is released (e.g., when a can or bottle is opened), the dissolved carbon dioxide forms bubbles, giving fizzy drinks their effervescent quality. Carbonated beverages include sodas, sparkling water, and many alcoholic drinks. The process of carbonating drinks dates back to the late 18th century and has become a standard practice in the beverage industry.