Why are diet soft drinks so much more fizzy than the full sugar soft drinks?

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Why are diet soft drinks so much more fizzy than the full sugar soft drinks?

In: Chemistry
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Ever had a McDonalds sprite?

Sugar takes up a lot of space.

It’s harder to dissolve as much gas, when so much sugar is also dissolved in the same space.

It’s because sugar causes the viscosity of the liquid to increase. Diet actually isn’t more fizzy, but rather, due to lower viscosity, the bubbles can rise to the surface with less resistance, so it appears more fizzy. Imagine boiling honey vs boiling water.