How does volume affect coke and mentos?

The volume of the liquid in which Mentos are dropped affects the intensity and duration of the reaction with Coke. In a larger volume, the gas produced can disperse more, leading to a less dramatic eruption. Conversely, in a smaller volume, the reaction is more concentrated, resulting in a higher and more explosive geyser as the carbon dioxide rapidly escapes. Thus, a smaller volume typically leads to a more impressive visual effect.