The bubbles in soda (also called soft drinks) are called carbonation. They are formed by dissolving carbon dioxide (CO2) during either bottling in the manufacturing facility (cans and bottles) or in a fast food restaurant when dispensing fountain soft drinks. read more
An unopened soda can is virtually bubble-free because the pressure inside the can keeps the carbon dioxide dissolved in the liquid. When you crack open the can, you release the pressure and allow the gas bubbles to wiggle free from the liquid and rise to the surface. read more