this post was submitted on 05 Feb 2026
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~~Diet Coke doesn't react more strongly with Mentos. It's just easier to clean up afterwards because the lack of sugar makes it less sticky.~~
Oops, guess I was wrong!
Diet Coke dosnt have sugar, which makes liquid thicker. Lower viscosity = CO₂ escapes faster. It also contains aspartame and potassium benzoate, which slightly lower surface tension and help bubbles form.
https://www.reagent.co.uk/blog/why-do-mentos-react-with-coca-cola/
I sit corrected!
I recall Mythbusters doing a thing on this as well testing other sodas and carbonated things. Diet Cike itself is a part of why there is such an energetic reaction.