Shakes soda flat
Why doesn't soda go flat immediately after opening?
If you open the bottle and reduce the pressure, you now have a supersaturated solution of carbon dioxide in water, so it is energetically beneficial for the gas to leak out of the solution.
However, in order for the gas to exit the solution, a bubble must form, and the mechanism by which this occurs is known as nucleation. However, there is an energy barrier that prevents tiny bubbles from forming. As a result, bubbles will only form if there is something to help them nucleate. More about this at:
If you look closely at the bubbles from an opened bottle of soda, you will find that they do not form accidentally. You will usually see streams of bubbles from an area that is assisted in nucleation, e.g. B. a defect in the glass wall of the bottle.
This means that the escape of the gas involves two steps:
Blistering on a core
Diffusion of carbon dioxide through the water to the core
And it's step 2 where the carbon dioxide takes a while to escape. If there is some aid to nucleation, e.g. B. in the case of a defect in the glass wall, a bubble forms very quickly. However, the formation of the bubble quickly consumes the dissolved carbon dioxide in its vicinity and the formation of more bubbles must wait for more carbon dioxide to diffuse to the nucleation site. The diffusion of gases dissolved in water is surprisingly slow, and although the gases typically only need to diffuse a few millimeters, it still takes a while to do so.
If you want to get the carbon dioxide out quickly, it is best to increase the number of nucleation sites so that you get many more nuclei and thus reduce the distance the dissolved gas needs to diffuse. The traditional way to do this is to toss a mint in the bottle of soda, but if you do, take a good step back.
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