[ExI] water escapes somehow

[spike at rainier66.com]

What I am seeing is making me crazy.  Cleaning out my garage, I found an
emergency kit that is used typically for earthquake preparedness.  I know
where I was working when I was given this kit: it was 2005.  So the kit is
about 18 years old.

 

In that kit were the usual things: emergency food rations, mylar blanket,
bandages, Tylenol, flashlight, that kinda stuff and also a pair of liter
bottles of water.  I noticed that both bottles had compressed, which was odd
considering the seal was intact and both still held pressure (they can't be
squeezed.)

 

There was clearly quite a bit of water missing from both bottles, but no way
out for the water that I can see.  So. I weighed them on a postal scale.  It
freaked my beak: both bottles weigh in at 816 grams.

 

Conclusion: both bottles lost about 20% of their volume from a sealed
disposable plastic bottle over the course of 18 years, without harming the
seal.  They lost the same amount down to the gram.

 

Any explanations please?

 

spike

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