Question

Where do the bubbles come from in naturally brewed root beer?   

Answer 1

Carbon dioxide gas is typically suspended in liquid with pressure, like a sealed bottle cap. When this carbon dioxide is released, carbon dioxide gas rises to escape in the form of bubbles or a frothy head.

Beer carbonation goes back hundreds of years. It’s simply a result of the way beer is brewed. As yeast ferments, sugars in both the fermentation bucket and bottle, carbon dioxide and alcohol are produced. Carbonation is a natural byproduct of the fermentation process. Bottle caps trap the carbon dioxide in beer while in the bottle, allowing it to remain carbonated until opened.

During primary fermentation, most of the carbon dioxide is allowed to escape the fermentation tank or bucket through an airlock. However, additional sugar is typically added to the beer while it is being bottled. The sugars continue to interact with yeast to produce carbon dioxide. Since the bottle is sealed with a cap, the carbon dioxide becomes trapped. When you crack open a beer, carbon dioxide should rise in the form of bubbles and a beautiful head when you pour beer. Carbonation due to fermentation is known as natural carbonation