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Gordy

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Reply with quote  #21 
Rick,

I was wondering if the dissolved co2 would displace that much liquid in the bottles. But also wondering if it is just the co2 escaping, why are the plastic bottles collapsing? I would think that once the pressure equalizes the co2 would stop escaping.

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Gordy,
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Rick H Parker

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Reply with quote  #22 
"why are the plastic bottles collapsing?"

The density and volume of a gas changes with temperature. Do you recall the hard boiled egg and milk bottle experiment in science class?


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #23 
Usually that experiment is conducted with hot water, and as the water vapor cools it condenses back to water. A bottle of water or soda stored at room temperature is not going to be appreciably affected by temperature. I don't suppose anyone has WEIGHED one of those shrunken bottles? If the liquid had simply contracted from temperature the weight would stay the same. A reduced weight would indicate a loss.
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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #24 
"I have had bottles of drinking water do it. Nothing in them but water, and still sealed."

In that case it would be escaping as water vapor, which is gaseous phase of water.

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Rick H Parker
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Rick H Parker

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Reply with quote  #25 
The the hard boiled egg and milk bottle experiment was done with air and fire. Light a fire in the milk bottle, place hard boiled egg on top. Fire heats and expands the air pushing air past the egg. Fire goes out air cools, air volume decreases sucks egg into the bottle.
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Rick H Parker
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Gordy

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Reply with quote  #26 
Rick, 

That would make sense if the bottles were exposed to a wide temperature differential's. But kept in the house with relatively stable temp's, I would not expect that to happen.

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Gordy,
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Reply with quote  #27 
"In that case it would be escaping as water vapor, which is gaseous phase of water."

My point exactly, and it would likely go THROUGH the plastic (osmosis).

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #28 
Did not know some plastic bottles are semipermeable to gases. It turns out gases permeability is a issue in the plastic bottle industry ... Something new every day.
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Rick H Parker
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Reply with quote  #29 
Given enough time, I suspect everything is permeable to some extent. It's just a matter of degree.
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Willie, Tampa Bay
GOM

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Reply with quote  #30 
Gordy, 

I have not noticed a problem with bottles of water going badl.  I suspect if you add bottles currently or formerly containing sugar, flavoring, and so on, there could be problems.  We poor consumers seldom know what is really in the many 'witche's brews' stocked on store shelves.  I've used the Canadian Mist cheap whiskey bottoles for a long time and have never had a problem.  One thing I do when storing H2O filled bottles is to leave them slightly loose and don't fill all the way.  When water freezes, it expands and pretty much upwardes.  If there's space for expansion and no pockets for compressed air to get trapped, usually no problem.  I'll tell you more about this next spring after I've taken four 3.000 gallon plastic tanks rhrough a NM winter.  I'm keeping my fingers crossed.  The manufacturer of my tanks sys his will survive virtually any freezing temp so long as the tanks aren't totally full and the air release valves on their tops is kept open.  We shall see..   GOM in New Mexico. 
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