Why do colas and ciders (carbonated beverages) produce froth?
Carbonated beverages such as cola and cider are filled with carbon dioxide gas under pressure.
When the bottle is opened, this carbon dioxide gas is released into the air. This carbon dioxide gas is what bubbles are made of.
The real name of this "carbon dioxide gas" is carbon dioxide. Carbon dioxide is a gas that humans breathe out through their mouths in exchange for oxygen, so of course there is a lot of carbon dioxide in the air. This carbon dioxide is contained in carbonated beverages.
