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Offlinetaibensis
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How heavy is CO2???
    #3397540 - 11/23/04 11:08 AM (12 years, 15 days ago)

From what I've read growers say that CO2 produced by mushroom growth tends to settle near the casing surface because CO2 is heavier than O2. My question is, in totally stagnant air, will CO2 completely separate forming its own layer and settle at the bottom? My concern is that I have one cool mist humidifier hooked upto four 90L bulk grow bins, and with four hoses hooked up to the cool mist the overall blow speed of the mist is greatly reduced. Would I still be able to achieve effective air exchange in this situation?


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OfflineHenry_Halleur
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Re: How heavy is CO2??? [Re: taibensis]
    #3397563 - 11/23/04 11:17 AM (12 years, 15 days ago)

yes it does form such a layer.
i guess it would be a good idea to fan from time to time.


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OfflineAnnoA
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Re: How heavy is CO2??? [Re: Henry_Halleur]
    #3397577 - 11/23/04 11:23 AM (12 years, 15 days ago)

No, it does not form such a layer.

While it is true that it is heavier as air, it is constantly mixed with the air by(at least 2 ) mechanisms:
- diffusion
- convection through currents in the fruiting chamber induced by the temperature gradient between the casing surface and the air.

So, while there might be certain concentration differences from top to bottom of the fruiting chamber, there is no sharp "layer" of CO2.


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OfflineHenry_Halleur
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Re: How heavy is CO2??? [Re: Henry_Halleur]
    #3397643 - 11/23/04 11:46 AM (12 years, 15 days ago)

ok but theoretically such a layer forms in stagnant air.
even though the o2 is mixed with the air by the mechanisms you've mentioned, i think regular fanning would be good, since the air is exchangeing quite slow.


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OfflineAnnoA
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Re: How heavy is CO2??? [Re: Henry_Halleur]
    #3397954 - 11/23/04 01:18 PM (12 years, 15 days ago)

> i think regular fanning would be good, since the air is exchanging quite slow.

Oh, definitely, active air exchange is important, no doubt.
I was only disputing the layer theory.


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Offlineamyloid
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Re: How heavy is CO2??? [Re: Anno]
    #3397980 - 11/23/04 01:26 PM (12 years, 15 days ago)

anno: the co2 is still MUCH more concentrated at the bottom them at the tippity top correct?


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Offlinediscman1
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Re: How heavy is CO2??? [Re: amyloid]
    #3398564 - 11/23/04 03:27 PM (12 years, 15 days ago)

I agree 100% with Anno. It seems people here get hung up on this way too much. Sure, CO2 is heavier than air, but they're both gasses. We're not talking about oil and water here. They will only seperate to form layers like that in a 100% stagnant environment. Even the slightest air currents will cause carbon dioxide and oxygen to intermingle. :wink:


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Invisiblederx
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Re: How heavy is CO2??? [Re: discman1]
    #3398597 - 11/23/04 03:35 PM (12 years, 15 days ago)

43.998 grams per mol


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better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.


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Offlineamyloid
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Re: How heavy is CO2??? [Re: derx]
    #3398624 - 11/23/04 03:43 PM (12 years, 15 days ago)


Quote:

43.998 grams per mol



sooooo wrong!

Molecular weight: 44.010
Physical m.w.: 43.989829


hehehe.


--------------------
"A human being is part of a whole, called by us the Universe, a part limited in time and space. He experiences himself, his thoughts and feelings, as something separated from the rest--a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest us. Our task must be to free ourselves from this prison by widening our circles of compassion to embrace all living creatures and the whole of nature in its beauty."
-Al Einstein


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Invisiblederx
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Re: How heavy is CO2??? [Re: amyloid]
    #3398653 - 11/23/04 03:49 PM (12 years, 15 days ago)

YOU GOT ME!


--------------------
better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.


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Offlinetaibensis
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Re: How heavy is CO2??? [Re: discman1]
    #3400294 - 11/23/04 09:49 PM (12 years, 15 days ago)

So guys, by what you guys are saying, isn't the slightest stream of fresh cool mist air sufficient for air exchange?


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