The favored term for carbonated beverages is now carbonated soft drink, or simply soft drink, to differentiate them from beverages containing alcohol. They are characterized by containing carbon dioxide (C02) gas, which effervesces (bubbles) when pressure is released, as when opening a bottle. Soft drinks have some added flavor and usually a sweetener to distinguish them from seltzer water. The primary ingredient of course is water, comprising from 85 to 99% of the formula.
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