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We did it on three bottles, different types of cola, happened on all of them. The liquid is significantly above the mark and when next to an unopened bottle it is above the level in the unopened bottle. I'm not actually looking for an explanation for my 6 year old, I would like to know for myself!

I'm not suggesting that matter has been magically created in the bottle. I am sure there is an explanation, just wondering what it is. We had an unopened bottle of coke, marked the liquid level on the side with a pen, opened the bottle and the liquid level is now above the pen mark. Something to...

Hello, I'm doing a science fair experiment with my 6 year old to determine whether different brands of cola drink have different amounts of carbon dioxide in them. We thought (clearly foolishly) that we could mark the side of the bottle with the liquid level, open the bottle and let it go flat...