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healing
Strangest
Registered: 02/22/11
Posts: 6,565
Loc: the universe, the milky w...
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Do canning jars produce an airtight seal?
#22078248 - 08/11/15 08:01 PM (8 years, 7 months ago) |
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When a canning jar is sealed, is it still possible for gasses to pass into or out of the jar?
-------------------- Open mind, open heart, open book.
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Pastywhyte
Say hello to my little friend
Registered: 09/15/12
Posts: 37,830
Loc: Canada
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Re: Do canning jars produce an airtight seal? [Re: healing]
#22078297 - 08/11/15 08:09 PM (8 years, 7 months ago) |
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seal 1 (sēl) n. 1. a. A device or material that is used to close off or fasten an opening or connection, especially to prevent the escape of a liquid or gas: used caulk as a seal around the window. b. An airtight closure: a door that lacks a tight seal. c. Something, such as a piece of tape, that is placed on a product or package to show that the contents have not been tampered with. d. The water in the trap of a drain that prevents sewer gas from escaping into a room.
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2shoes
The anti-agar
Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078314 - 08/11/15 08:12 PM (8 years, 7 months ago) |
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No a hole or filter is needed for gas exchange. As a above poster pretty much said.
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healing
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078317 - 08/11/15 08:12 PM (8 years, 7 months ago) |
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No. I understand what a seal is. There is a member on the pub who believes that canning jars do not produce an air tight seal, and that neither do plastic vacuum sealing bags. So I would like some other members to clarify the matter.
-------------------- Open mind, open heart, open book.
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Pastywhyte
Say hello to my little friend
Registered: 09/15/12
Posts: 37,830
Loc: Canada
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Re: Do canning jars produce an airtight seal? [Re: healing] 1
#22078328 - 08/11/15 08:15 PM (8 years, 7 months ago) |
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Unless you modify the lid to have a filter then the jar is sealed. Plastic lids sometimes have an imperfect seal but its rarely a problem. Myco bags come with a built in filter so they are not airtight however if you preseal them the restriction is enough to blow them up in the PC. Don't listen to people in the pub. There is a reason they post there.
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healing
Strangest
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078339 - 08/11/15 08:17 PM (8 years, 7 months ago) |
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Right, but that person is spreading a bunch of stupidity and challenging the pub to prove them wrong. So I thought I'd ask in a place where air tight seals are a practical matter success or failure.
-------------------- Open mind, open heart, open book.
Edited by healing (08/11/15 08:18 PM)
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healing
Strangest
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Posts: 6,565
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Re: Do canning jars produce an airtight seal? [Re: healing]
#22078349 - 08/11/15 08:19 PM (8 years, 7 months ago) |
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They seem to be of the densest variety, too. Only the highest caliber of evidence will dissuade their tightly sealed little mind.
-------------------- Open mind, open heart, open book.
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Pastywhyte
Say hello to my little friend
Registered: 09/15/12
Posts: 37,830
Loc: Canada
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Re: Do canning jars produce an airtight seal? [Re: healing] 1
#22078353 - 08/11/15 08:19 PM (8 years, 7 months ago) |
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Stoopid people in the pub?
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2shoes
The anti-agar
Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078368 - 08/11/15 08:21 PM (8 years, 7 months ago) |
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When using plastic lids I can smell the weed that's in the jar. With the metal ones I can't smell it at all.
I used parafilm when I stored my last jar of weed with a plastic lid which seemed to help.
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healing
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Re: Do canning jars produce an airtight seal? [Re: 2shoes]
#22078401 - 08/11/15 08:27 PM (8 years, 7 months ago) |
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Quote:
Pastywhyte said: Stoopid people in the pub?
So we're clear, though, canning jars produce an airtight seal through which no gasses or moisture can pass.
Can we please confirm this with as many members and much disdain as possible?
-------------------- Open mind, open heart, open book.
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2shoes
The anti-agar
Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Do canning jars produce an airtight seal? [Re: healing]
#22078409 - 08/11/15 08:29 PM (8 years, 7 months ago) |
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A brand new lid will create an airtight seal if prepared properly..
My 2 cents.
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Pastywhyte
Say hello to my little friend
Registered: 09/15/12
Posts: 37,830
Loc: Canada
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Re: Do canning jars produce an airtight seal? [Re: healing]
#22078555 - 08/11/15 08:55 PM (8 years, 7 months ago) |
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Quote:
healing said:
Quote:
Pastywhyte said: Stoopid people in the pub?
So we're clear, though, canning jars produce an airtight seal through which no gasses or moisture can pass.
Can we please confirm this with as many members and much disdain as possible?
I'm not sure I understand the point. To prove to one guy that he is wrong? This seems dumb and is not really a cultivation topic. This thread should technically be locked.
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healing
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078574 - 08/11/15 08:58 PM (8 years, 7 months ago) |
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Whatev's. I'm satisfied.
Or if you want we could get in a heated debate about it and go for some ban points. I don't have any Could be fun IDK IDC anymore.
Edited by healing (08/11/15 09:04 PM)
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2shoes
The anti-agar
Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Do canning jars produce an airtight seal? [Re: healing] 1
#22078614 - 08/11/15 09:05 PM (8 years, 7 months ago) |
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maddchef
Vaginal escape artist
Registered: 09/04/09
Posts: 5,602
Loc: Your mom's vag
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Re: Do canning jars produce an airtight seal? [Re: healing]
#22078615 - 08/11/15 09:06 PM (8 years, 7 months ago) |
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Actually until the jar cools, no it doesn't provide a perfect seal as I understand it. With canning jars I thought pressure could still force its way out and only on cooling will the lid actually seal perfectly.
So the answer is yes and no. It depends on what the seal is trying to keep in or out.
Also on vac seal bags the answer is iffy. Most bags will at one point begin to leak since they are still porous. Want proof? Vac seal some weed, let it sit a week or two, and wave it in front of a drug dog.
Report back after hospital
-------------------- In the land of the blind, the one eyed man is king. All mushrooms are edible, but some only once..... Easier than cakes I do science and shit.
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Pastywhyte
Say hello to my little friend
Registered: 09/15/12
Posts: 37,830
Loc: Canada
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Re: Do canning jars produce an airtight seal? [Re: maddchef]
#22078628 - 08/11/15 09:08 PM (8 years, 7 months ago) |
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You mean to say people happen to have jars laying around that do not go through a PC or sterilizer? WTF do they do with them
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healing
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Re: Do canning jars produce an airtight seal? [Re: Pastywhyte]
#22078674 - 08/11/15 09:18 PM (8 years, 7 months ago) |
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I'm stumped. I guess you could use them as cups with convenient lids.
-------------------- Open mind, open heart, open book.
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SpitballJedi
Ancient Astronaut
Registered: 10/13/12
Posts: 8,598
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Re: Do canning jars produce an airtight seal? [Re: healing] 1
#22078751 - 08/11/15 09:33 PM (8 years, 7 months ago) |
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If someone is trying to argue that canning jars are not airtight, it's likely because they are confusing the generally accepted use of the term with the more technical term "permeability". Being airtight does not mean it's impermeable.
Generally, most people say airtight to mean the normal air around you doesn't get in, or gets in very slowly, thus keeping things fresher for longer, mostly because of reduction in oxidation. Some gases can permeate some materials even though we would still call the container "airtight".
Most plastics and metals are permeable by many gases, such as oxygen; especially thin soft plastic and thin soft metals. I don't think "airtight" is used as a scientific term because it has a loose meaning. I think in very important scientific applications, materials are often made to be impermeable to specific gases or liquids as opposed to just being "airtight". Pressure and temperature also affect permeability.
So, IMHO, canning jars are airtight because they keep the air around us out. Some oxygen permeates the metal lid, very slowly over long periods though, and probably other gases at different rates. But, it's not impermeable, especially the lid, to all gasses. I know drug dogs can smell weed in a jar.
The tires on your car are airtight, but the rubber is not impermeable to the air under pressure inside, so you have to add air once in a while.
It just boils down to what he means by airtight and what "air" he's talking about. The first step in any debate is defining what the debate is specifically about. The next step is to agree on definition of terms. These two steps keep people from moving the goal posts. Don't waste your time arguing about something just to find out you have a different definition of terms.
-------------------- The Basics A little civility goes a long way The Noob Forum The Hammock Hangers' Forum
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healing
Strangest
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Posts: 6,565
Loc: the universe, the milky w...
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Re: Do canning jars produce an airtight seal? [Re: SpitballJedi]
#22078786 - 08/11/15 09:40 PM (8 years, 7 months ago) |
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Maybe. You'll have to ask them. It doesn't seem like they frequent mushcult, otherwise he'd probably chime in and argue or demand satisfaction.
-------------------- Open mind, open heart, open book.
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2shoes
The anti-agar
Registered: 04/07/11
Posts: 3,124
Loc: Not in a SAB
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Re: Do canning jars produce an airtight seal? [Re: SpitballJedi]
#22078792 - 08/11/15 09:41 PM (8 years, 7 months ago) |
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Its a pub fight mane...... aka not worth it...
Good info spitballjedi.
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