why do sodas fizz up when you pour too much in at once?

Question

why do sodas fizz up when you pour too much in at once?

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Answer 1

Soda has dissolved carbon dioxide (CO2) gas which stays in the liquid at pressure. When you open the container, the pressure is released and the CO2 starts to leave the liquid. The rate it comes out depends on how much surface there is to the liquid. If you pour quickly, the liquid splashes and swirls, mixing in a huge number of tiny air bubbles which are all extra places for the CO2 to escape. Even the escaping bubbles of CO2 speed up the process, making an expanding foam.