How is the meaning fermentation related to the word bubble?

Answer 1

During fermentation, yeast usually consumes sugar and converts into ethanol (ethyl/drinking alcohol) and carbon dioxide gas. This phenomenon is usually observable during the process of making bread (letting the dough rise) or brewing beer (adding yeast into a liquid that contains sugars that come from boiling malted grains [malting is a process in which the seeds be allowed to partially germinate to convert the contents of the grains into sugar] to release the sugars into the water).

Answer 2

Fermentation is a process in which microorganisms like yeast convert sugars into alcohol or organic acids, often producing bubbles of carbon dioxide gas as a byproduct. The bubbles are a result of the gas released during the fermentation process, creating carbonation in beverages like beer or sparkling wine.