[ExI] blocked?

[spike at rainier66.com]

Hi Exi, did you see my post come thru?  It looked to me like it did.  Below
this is the message I posted:

 

 

 



 

 

 

 

 

 

Thx BillK.  Only the first one of ChatGPT's answers (shown below) is
applicable in this case.  The bottles were inside a canvas bag (so no light
exposure (so no microbial growth)) and were not handled.  The gas space
didn't change much (but the volume of the bottle changed by a lot (about 200
cc (so the bottles themselves appeared to be collapsed or crushed.))  The
bottles were stored indoors (no significant temperature changes) with
nothing on top of them, so they were not under pressure, no altitude
changes, no handling.  The bottles were on their sides, so the caps were
submerged the entire time.

 

Conclusion: these teenage bottles demonstrated water diffuses thru PVC over
time.  I was at a tragically advanced age when I first learned that was even
a possibility.  So cool!  Had you wagered me on this before yesterday, I
woulda lost that bet, arguing that water does not diffuse thru plastic, and
certainly not at a perfectly consistent rate.  Well, it does.  Now I have a
most remarkable example of it.

 

spike

 

 

 

 

 

 

 



why do plastic water bottles lose water and shrink over time

ChatGPT

Plastic water bottles can appear to lose water and shrink over time due to a
combination of factors:

1.	Permeability: Plastic is a porous material, albeit on a very small
scale. Over time, tiny molecules of water vapor can pass through the plastic
walls of the bottle. This is called permeability. As water molecules slowly
escape through the plastic, the overall volume of water inside the bottle
decreases, causing the bottle to appear to shrink.
2.	Gas Exchange: Oxygen and other gases in the air can also pass
through the plastic to some extent. This can result in a slight change in
the internal pressure of the bottle, which may contribute to the appearance
of the bottle "collapsing" or shrinking.
3.	Temperature Changes: Temperature fluctuations can affect the
plastic's properties, including its permeability and flexibility. If the
temperature drops, the plastic may contract slightly, causing the bottle to
appear to shrink.
4.	Microbial Growth: If there are any contaminants or impurities
present in the water, such as microorganisms, they could potentially consume
some of the water and release gases, leading to a decrease in the water
volume and a change in the internal pressure.
5.	Handling and Squeezing: Repeatedly squeezing or pressing the bottle
can also cause it to deform slightly, making it appear to have lost water.
This is especially noticeable if the plastic is flexible and the pressure
exerted on the bottle is significant.

It's worth noting that while these factors can contribute to the perception
of water loss and shrinkage in plastic water bottles, the actual amount of
water lost is usually very small and may not be noticeable in the short
term. Additionally, the extent to which these factors affect the bottle's
appearance can vary depending on the type of plastic used, the quality of
manufacturing, and the conditions in which the bottle is stored.

Top of Form

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20230810/4f33ce9f/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 103697 bytes
Desc: not available
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20230810/4f33ce9f/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 841 bytes
Desc: not available
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20230810/4f33ce9f/attachment-0001.jpg>