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 Visigoth
enthusiast
Registered: 11/28/01
Posts: 481
Last seen: 10 years, 10 months
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 Jar broke while PCing, why why why?!?!?! 
#590521 - 03/26/02 10:23 PM (21 years, 8 months ago) |
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OK, my friend just pressure cooked some quart jars of birdseed, when they were done he took em out to shake em, one of em had broken clean in half, near the bottom about an inch up. He put a washrag in between the jars and the bottom and a piece of plastic on top of that. Why in the world dd the jar break?? He wants to make sure this doesn't happen too often as it could get expensive. Thanks!!!!
Vis
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"15 minutes in freezing conditions?!?! You'd become a popsicle before you made that!!!"
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SWiTtles
newbie
Registered: 02/12/02
Posts: 30
Loc: looks like a hand
Last seen: 19 years, 7 months
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 Re: Jar broke while PCing, why why why?!?!?! [Re: Visigoth]
#590524 - 03/26/02 10:37 PM (21 years, 8 months ago) |
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3 words
sudden temperature change
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"one day we'll be able to model your brain as a mathmatical equation. since the number of equations possible for the human species is NOT infinate, we will ALL live again"
-Me
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 WakingUpLate
addict
Registered: 12/29/01
Posts: 559
Loc: Born on a mountain, Raise...
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Re: Jar broke while PCing, why why why?!?!?! [Re: SWiTtles]
#590536 - 03/26/02 10:55 PM (21 years, 8 months ago) |
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The rest of those, who have gone before us,
cannot settle the unrest of those who follow.
(Finding Forrester)
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Visigoth
enthusiast
Registered: 11/28/01
Posts: 481
Last seen: 10 years, 10 months
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Re: Jar broke while PCing, why why why?!?!?! [Re: WakingUpLate]
#590976 - 03/27/02 11:40 AM (21 years, 8 months ago) |
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well ur supposed to take em out while they're still hot and shake em to evenly distribute the wet kernels w. the dry. So how do I account for this?? Any tips? Thanks so much!!!
Vis
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"15 minutes in freezing conditions?!?! You'd become a popsicle before you made that!!!"
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WakingUpLate
addict
Registered: 12/29/01
Posts: 559
Loc: Born on a mountain, Raise...
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Re: Jar broke while PCing, why why why?!?!?! [Re: Visigoth]
#591083 - 03/27/02 02:39 PM (21 years, 8 months ago) |
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Tough one. Did it break while he was shaking it? Here's a few
guesses. If the jars were cold when they went in the cooker,
it could have cracked early and then finally broke apart later.
Also, was the kitchen cold? If this was the case, it might help
to wait just a little longer, or wrap them in a towel so they don't
cool as fast. It's also possible that he was holding it with a
cloth and that bottom inch was all that was sticking out so it
cooled unevenly and cracked it that way. Another scenario
could be that the bottom of the jar was sitting in the hot water
and the cool air rushing in cooled the top. All of this is speculation
on my part so I may be way off base. But you can bet it was
uneven cooling or uneven heating. Sorry you had a run of bad
luck. At least it was only one jar. Which makes me wonder,
Was it the first jar out, or the last jar out, or neither.
Anyway, hope that helps you figure out your problem.
Anyone Else?
Free Spore Ring
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The rest of those, who have gone before us,
cannot settle the unrest of those who follow.
(Finding Forrester)
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Visigoth
enthusiast
Registered: 11/28/01
Posts: 481
Last seen: 10 years, 10 months
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Re: Jar broke while PCing, why why why?!?!?! [Re: WakingUpLate]
#591156 - 03/27/02 04:44 PM (21 years, 8 months ago) |
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don't know if this'll help or not, but it WAS the last jar out of the PC.
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"15 minutes in freezing conditions?!?! You'd become a popsicle before you made that!!!"
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Visigoth
enthusiast
Registered: 11/28/01
Posts: 481
Last seen: 10 years, 10 months
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Re: Jar broke while PCing, why why why?!?!?! [Re: WakingUpLate]
#591157 - 03/27/02 04:45 PM (21 years, 8 months ago) |
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don't know if this'll help or not, but it WAS the last jar out of the PC. And no, it didn't happen while shaking, he just picked it up, and the bottom inch fell off. Pretty crazy.
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"15 minutes in freezing conditions?!?! You'd become a popsicle before you made that!!!"
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WakingUpLate
addict
Registered: 12/29/01
Posts: 559
Loc: Born on a mountain, Raise...
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 Re: Jar broke while PCing, why why why?!?!?! [Re: Visigoth]
#591199 - 03/27/02 05:39 PM (21 years, 8 months ago) |
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Well that narrows it down, Just guessing still...
The jar broke at the water line or just above it?
And the kitchen was cool? If this sounds right
then here's my guess:
The water held the bottom of the jar hot, and the
cool air caused the top of the jar to contract. Which
was basically to opposing forces pushing the glass in
two directions at the same time. If this is the case. Then
it can be solved by putting the lid back on between jars.
Again it's just a guess, but ya gotta start somewhere.
Hope that helps.
Free Spore Ring
--------------------
The rest of those, who have gone before us,
cannot settle the unrest of those who follow.
(Finding Forrester)
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Visigoth
enthusiast
Registered: 11/28/01
Posts: 481
Last seen: 10 years, 10 months
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Re: Jar broke while PCing, why why why?!?!?! [Re: WakingUpLate]
#591388 - 03/27/02 09:35 PM (21 years, 8 months ago) |
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Or maybe I could just take them all out at once?? Cool, thanks fo the replies Waking, u have been most helpful!!!
Vis
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"15 minutes in freezing conditions?!?! You'd become a popsicle before you made that!!!"
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WakingUpLate
addict
Registered: 12/29/01
Posts: 559
Loc: Born on a mountain, Raise...
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 Re: Jar broke while PCing, why why why?!?!?! [Re: Visigoth]
#591790 - 03/28/02 10:28 AM (21 years, 8 months ago) |
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Bump,
Obviously, I'm no physics major so would one of you guys
that are a little sharper on this matter, tell us if we're looking
in the right direction. Busting jars is some serious shit.
Free Spore Ring
--------------------
The rest of those, who have gone before us,
cannot settle the unrest of those who follow.
(Finding Forrester)
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,166
Loc: my room
Last seen: 1 day, 20 hours
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Re: Jar broke while PCing, why why why?!?!?! [Re: WakingUpLate]
#591818 - 03/28/02 11:04 AM (21 years, 8 months ago) |
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As you said, a big temperature gradient in glass causes forces which break the glass.
It happens mostly when the jars are heated too fast, so the bottom of the jar is in hot water and expands more than the upper part of the jar.
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