Why is the effect of the mento explosion not as big as the Diet Coke explosion?

The effect of the mento explosion is not as dramatic as the Diet Coke explosion primarily due to the difference in carbonation levels and the amount of gas released. Diet Coke contains a higher concentration of carbon dioxide, which rapidly escapes when the pressure is released, creating a more explosive reaction. Mento candies, while effective in nucleating bubbles, don't produce as much carbonation as the soda itself. Additionally, the surface area of the Mentos provides more nucleation sites but does not generate the same volume of gas as the release from a carbonated beverage.