This question already has an answer here:
I’m posting my question because I read this original post. The post was from 2016, so I’m reposting in hopes that someone can answer. Here’s the original post: (Also, do not flag as duplicate. If you read my experience below, the answers from the previous post do not explain why this is happening.)
I'm sitting in a room next to some totally unopened cans of carbonated soft drinks (if it matters — the two affected cans are Coke Zero and Diet Coke). These cans were unboxed approximately two days ago and were full, but now are seemingly mostly empty!
There is no puncture in either can, and compressing them results in the dent being counteracted by pressure inside the can. Shaking and weighing the can (by hand; I don't have a scale anywhere near) reveals that a good majority (75%) of the can is now effectively empty.
The cans spent the whole time stored inside a normal room with a temperature of ±22ºC and automatic fluorescent lighting which is on for 16 hours a day.
Finally, there is no condensed drink on the outside wall of the can, and the cans themselves are externally room temperature, so I'm really puzzled about what process could do this.
I'm hesitant to open the cans because I'm not sure what the result of that could be, however if it's deemed here that there's little or no risk, I'll do that and update the question.
What possible reason could there be for these cans becoming empty?
Now here is my post/question:
I know exactly what you are talking about! Only my soda cans were not expired! I have a soda machine that I purchased about 10 years back. I load the machine myself with different sodas...coke, Diet Coke, sprite, dr.pepper etc....so I know that the cans are full when I put them in there.
Over the past 10 years I have found around 10-15 cans that are totally empty. Sometimes there might be a small amount of soda in them, but not much. There are no puncture holes, no sticky residue on the can, nor any residue inside the machine. Every time I found one, I thought I was going to have to clean up a mess....but nope, no mess..nothing. There is still pressure inside the can...not as much as a regular can, but there is still pressure. I’ve opened all of them. No bad reactions! Haha!
I’ve looked at the seal at the top of the can. I’ve even put one under water to look for leaking bubbles. Nothing... I’ve been perplexed for years and have asked everyone I know, and I have yet to find a viable explanation. If anyone can fill me in, I would love to know the answer!