# Ex-Post Facto Soda Pop Eruption: Why?

**URL:** <https://boards.straightdope.com/t/ex-post-facto-soda-pop-eruption-why/241468>\
**Category:** Factual Questions\
**Created:** [April 22, 2004, 6:08pm UTC](https://boards.straightdope.com/t/ex-post-facto-soda-pop-eruption-why/241468 "2004-04-22T18:08:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jinx](https://avatars.discourse-cdn.com/v4/letter/j/c6cbf5/32.png) [@Jinx](https://boards.straightdope.com/u/Jinx)\
**Post date:** [April 22, 2004, 6:08pm UTC](https://boards.straightdope.com/t/ex-post-facto-soda-pop-eruption-why/241468/1 "2004-04-22T18:08:07Z")

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Sometimes, I have had a bottle of soda erupt on me after the cap had been removed for a good 30 seconds, at least. No further aggitation was involved. Why would this be? Apparently, the pressure faile to equalize, but what’s the nitty gritty on this phenomenon? - Jinx

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**Author:** ![Padeye](https://avatars.discourse-cdn.com/v4/letter/p/a9a28c/32.png) [@Padeye](https://boards.straightdope.com/u/Padeye)\
**Post date:** [April 22, 2004, 6:39pm UTC](https://boards.straightdope.com/t/ex-post-facto-soda-pop-eruption-why/241468/2 "2004-04-22T18:39:56Z")

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Liquid that is supersaturated with gas can be a bit touchy and sometimes it takes a nucleation point to start a chain reaction and release all the gas. It could be nothing more than the right molecule bumping an imperfection in the glass.