Which soft drink stays fizzy the longest?

It's tough to say definitively which soft drink stays fizzy the longest as there are many factors involved:

* Carbonation Level: The amount of CO2 dissolved in the beverage is the primary factor. Higher initial carbonation means more fizz will be retained.

* Packaging: A sealed, tightly-capped bottle or can will keep fizz longer than an open container.

* Temperature: Colder drinks retain carbonation better than warmer ones.

* Ingredients: Some additives, like sweeteners, can impact carbonation retention.

However, some common observations suggest:

* Diet Sodas: Generally, diet sodas tend to stay fizzy longer than regular sodas. This is likely due to the lack of sugar, which can react with the CO2 and reduce fizz.

* Clear Sodas: Clear sodas, like Sprite or 7-Up, might retain their fizz longer than dark sodas like Coke or Pepsi. This is due to the darker color potentially reacting with the CO2.

To maximize fizz retention:

* Buy the coldest soda available.

* Store the soda in the refrigerator.

* Open and pour the soda immediately before drinking.

* Don't leave the soda open for long periods.

Ultimately, the "fizziest" soda is subjective and depends on individual preferences and how long you let it sit.