When you pour soda out of a newly opened bottle which prouces more fizz regular or diet soda?

The amount of fizz in a soda is not determined by whether it is regular or diet, but by the amount of carbon dioxide gas that is dissolved in the soda. When a bottle of soda is opened, the pressure inside the bottle is released, which allows the dissolved carbon dioxide gas to escape from the soda and form bubbles. The bubbles then rise to the surface of the soda and create the fizz.