The bubbles and fizz you see in your soda is produced by carbonation. Carbonation injects CO2 into the beverage under pressure. When you open the soda the pressure is released, hence the hissing sound. Once there is no pressure the CO2 slowly escapes and the soda “goes flat.”
The reason sodas fizz in the first place is that when you open a can or bottle, you lower the pressure and allow the carbon dioxide stored inside to form bubbles. They rise to the surface of the beverage, pop, and the gas escapes from the container. Over time, the carbon dioxide dissipates to the point tha tthere is not enough left to create bubbles.
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