Question

To keep the "fizz" in cartooned beverages after they have been opened, should you store them in a refrigerator or in a cabinet?

Answer 1

Carbon dioxide (and all gases) are more soluble in a liquid at LOWER temperature.

Explanation:

Of course when soft drinks are bottled they are OVERPRESSURED with carbon dioxide; i.e. put under a partial pressure of 1-2 atmospheres of carbon dioxide. The soft-drink is carbonated and fizzy WHEN OPENED. If you leave the bottle open, eventually the concentration of carbon dioxide will reach an equilibrium concentration with atmospheric carbon dioxide.

When you bottle beer or ginger beer at home, just before capping the bottle, you add a small teaspoon of sugar, which is fermented to carbon dioxide and water, so that your home brew self-carbonates.