Why does sprite fizz more than coke?

Sprite fizzes more than Coke because it contains more carbon dioxide gas. Sprite contains 2.2 volumes of CO2 per volume of liquid, compared to 1.75 volumes of CO2 per volume of liquid in Coke. This means that Sprite has about 25% more dissolved gas than Coke.

As Sprite is poured and exposed to atmospheric pressure, the dissolved gas quickly comes out of the liquid as tiny bubbles. These bubbles create the characteristic "fizz" of Sprite. The higher concentration of dissolved gas in Sprite means that it will produce more bubbles and therefore more fizz than Coke.

In addition to its higher content of dissolved CO2, Sprite also has a lower pH level than Coke (3.27 versus 2.5). This means that Sprite is more acidic than Coke. Acidic drinks create more bubbles than non-acidic drinks, because the acid reacts with the sugars in the drink to produce more carbon dioxide gas.

Finally, Sprite contains some artificial sweeteners that also contribute to its high level of fizz. These sweeteners are not as dense as sugar, so they take up less space in the liquid. This leaves more room for dissolved gas, which in turn produces more bubbles.