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Carbonated water (aka soda water) contains carbon dioxide gas that is held in a suspension within the liquid. So long as the drink is tightly closed, the pressure keeps the gas dissolved in the liquid. As soon as the pressure decreases - in other words, as soon as you open the drink - the gas escapes. The faster the pressure decreases, the more the carbon dioxide bubbles up, and sometimes it escapes so fast that it bubbles over.

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16y ago

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