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OfflineDubiousDuo
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A little thing called diffusion.
    #3446307 - 12/04/04 06:08 PM (12 years, 9 months ago)

When making a fruiting chamber, if one does not have air circulation it would be presumable that holes covered by tyvek would permit gas exchange. I have seen people post that these holes should be just above the casing layer. My question is this, does diffusion not take place no matter where the holes are, meaning that holes in the lid would allow for just as much air exchange, so as  the ratios of components of air inside chamber is equal to that outside, other than those contams and water because tyvek is hydrophobic i believe. What do u scientists out there think? It seems more efficient to just have holes in a lid rather than in the tub ( which could be used in TiT, not so however if it has holes in the side. :rocket:


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Offlinelesstutrey
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Re: A little thing called diffusion. [Re: DubiousDuo]
    #3446340 - 12/04/04 06:15 PM (12 years, 9 months ago)

no. c02 is heavier then air. it rests at the bottom, therefore you want them around the casing level to diffuse that c02 out. the holes on top would be for difusing just air as it the c02 is at the bottom.

and no, tyvek is not hydrophobic. infact it permits water exchange, that is why specificaly its used in house wrapping. It prevents wind but it will allow moisture to permiate through.


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OfflineDubiousDuo
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Re: A little thing called diffusion. [Re: lesstutrey]
    #3446416 - 12/04/04 06:34 PM (12 years, 9 months ago)

hmm CO2 being heavier than simply O2? air is a gaseous mixture so i assumed it would diffuse, regardless of atomic weight, any physics people know?? i thought air mixtures will diffuse evenly, regadless of the components molecular weight. tyvek seems to be atleast semipermeable, otherwise jars would dry out after a while. which i guess they do, but not drastically.


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Invisiblederx
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Re: A little thing called diffusion. [Re: DubiousDuo]
    #3446854 - 12/04/04 08:08 PM (12 years, 9 months ago)

Dibuousduo: Yes gases are miscible in all proportions, but that only holds true if there is some type of current. If let to rest, gases will layer.


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InvisibleADoobie
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Re: A little thing called diffusion. [Re: DubiousDuo]
    #3446937 - 12/04/04 08:23 PM (12 years, 9 months ago)

Molecular weight does have an effect, and "air mixtures" don't diffuse evenly, because that's exactly what they are - air mixtures...except the CO2 comprises the bottom part of that mixture in a sealed environment because the CO2 gas is heavier than air...

In a winery, CO2 is often used to "top" a tank...that is, put a CO2 hose in the opening at the top, and turn on your source...you will feel air rushing out at you for sure...but its O2, not CO2.

What derx said basically...
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Edited by ADoobie (12/04/04 08:25 PM)


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Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

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