How does champagne get its bubbles?

The bubbles in champagne are brought on by the release of co2 gas.  find more info This gas is produced during the fermentation process, where yeast breaks down the sugars in the grape juice and transforms them into alcohol.

As the fermentation procedure continues, the carbon dioxide gas is produced in increasing quantities and ultimately starts to leave from the champagne. This is why champagne needs to be kept in a special bottle that can withstand the pressure of the gas.

The unexpected release of pressure causes the carbon dioxide gas to get away from the liquid in the type of bubbles when you open a bottle of champagne. That's why champagne is always served chilled, as this helps to keep the co2 gas in option.

https://ivfsurvivalguide.com/?p=618 Now you understand how champagne gets its bubbles!