What is the main gas in fizzy pop?

The main gas in fizzy pop is carbon dioxide (CO2). It is a colourless, odourless and tasteless gas that is naturally present in the atmosphere and is also produced by the fermentation of sugars by yeast. When CO2 is dissolved in water under pressure, it forms carbonic acid, which gives fizzy pop its sharp, bubbly taste and fizzy texture. The amount of CO2 in fizzy pop can vary depending on the type of drink, but it is typically around 3-4% by volume.