scientific reasons for 'when unexpired dairy bottle explodes(figuratively speaking)...'

recently i got a quart container (plastic) of fermented (yogurt kind) dairy product.. its expire date was july (we are in may now). also another bottle was also next to it - its expire date was june. yet today when i was moving the 2 plastic bottles from one rack to another in the refrigerator, one popped.. (the july expiration one).. the whole plastic was so bulged.. so i knew it was foaming and could burst.. so i open the lid and let it foam for 5 minutes.. i tried to smell it, and it was overly rotten or expired necessarily, but it did smell a little off.. what do you think could have caused this?
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25112Asked:
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d-glitchCommented:
The nominal expiration date assumes proper refrigeration for the life of the product.

The spoiled product could have been transported in a truck with bad cooling system, or could have been left on a sunny loading dock over a lunch hour.

It could also have been contaminated at the source, although that is less likely.
Paul MacDonaldDirector, Information SystemsCommented:
I would suspect a puncture or other leak in the container.  If it's small enough - or near the lid - air could get through without product getting out.
d-glitchCommented:
If there was a leak in the container, I don't think it would not bulge.  The fermentation gases could escape.
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25112Author Commented:
I see.. so bottom line, is either through heat exposure at some point or faulty source, the products got over-fermented and hence bulging (expanding).

would all such expired products do this (expansion/bulging) at some point or not necessarily?
ozoCommented:
Most metabolic processes involved in spoilage produce carbon dioxide, but whether this would lead to bulging may depend on the container.
25112Author Commented:
>>spoilage produce carbon dioxide, but whether this would lead to bulging may depend on the container.

would that imply glass bottle could break? and plastic expand itself to bulged position?
aburrCommented:
"would that imply glass bottle could break? and plastic expand itself to bulged position? "
Almost anything "could" happen but some things are more probable than others. It is unlikely that glass containers would explode. Spoiled plastic containers would almost certainly bulge but probably not burst. A lot depends on the spoilage mechanism and length of time that gases were generated which is quite variable
ozoCommented:
Some may, but I'd expect most glass bottles would be able to contain the pressure to the point where growth stops.
I would also expect the seals to be designed to leak before the glass broke.
Sturdy plastic may also be able to contain the pressure (or leak) without noticeable bulging.
Dave BaldwinFixer of ProblemsCommented:
It also could have been contaminated with something that sped up the process.
viki2000Commented:
you forgot the misreading, misprinting, somebody set you up or made a joke, unexplained paranormal activities...
nobusCommented:
>>  It is unlikely that glass containers would explode.   <<  on the contrary
ask any champaign manufacturer - he will show you the exploded bottles (and these are stronger than normal bottles already!)
ozoCommented:
Almost anything "could" happen but
on the contrary
Not necessarily contrary, since champaign manufacturers would have enough bottles to be able to show examples of unlikely ones.
If they can show you more examples of unexploded bottles, there would be no contradiction.
nobusCommented:
have it your way; if you don't believe me
i only hope no bottle ever explodes in your hands
ozoCommented:
"don't believe me" does not follow from "no contradiction"
I am not saying I don't believe you, I am saying it is logically possible to believe both of you.
nickg5Commented:
Do not let un-expired fool you. We have had cartons of milk go sour on us. We took it back to the store and got a replacement or refund.
It needs to be kept in a temperature of about 36-37 degrees. In summer the temperature in our unit can approach 40 degrees. This is not going to help our dairy products last longer, especially milk.

Dairy products as they age get sour. Then it curdles and bacteria begins to grow and this produces gas. As more time goes by the buildup inside the container causes it to expand and can explode.

Souring, curdling, bacteria, gas, container expansion..............

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25112Author Commented:
thx for all the inputs. will help to treat these with more attention and care.
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