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OfflineArctic_Fox
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How exactly does gas exchange work without airflow?
    #28899771 - 08/04/24 11:32 AM (5 months, 10 days ago)

Fungus requires oxygen, and produces carbon dioxide. So we put filtered openings in our sealed vessels to allow for gas exchange.

It's counter-intuitive that this works, though. What moves the gases? There is no airflow. There's no convection, no pressure differential, and no turbulence (correct me if I am wrong). Why does any gas move through the threshold?


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Offlinephenyl
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Re: How exactly does gas exchange work without airflow? [Re: Arctic_Fox] * 1
    #28899791 - 08/04/24 11:58 AM (5 months, 10 days ago)



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OfflineThe Tao
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Re: How exactly does gas exchange work without airflow? [Re: Arctic_Fox] * 1
    #28899809 - 08/04/24 12:08 PM (5 months, 10 days ago)

Include the metabolic process produced by mycelium growing in the vessel. Why is there condensation on the inside rather than the outside?

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OfflineArctic_Fox
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Re: How exactly does gas exchange work without airflow? [Re: Arctic_Fox]
    #28899909 - 08/04/24 01:12 PM (5 months, 10 days ago)

Quote:

The Tao said:
Include the metabolic process produced by mycelium growing in the vessel. Why is there condensation on the inside rather than the outside?



Is it because the mycelium is releasing water into the air? Condensation forms when the temperature of air drops below its dew point.


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OfflineB Traven
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Re: How exactly does gas exchange work without airflow? [Re: Arctic_Fox]
    #28899925 - 08/04/24 01:30 PM (5 months, 10 days ago)

Yep, it's all relative concentrations. Higher CO2 levels inside the vessel, relative to the outside atmosphere, will lead to net diffusion across the filter until equilibrium is achieved. But of course that'll never happen, because it's one tiny vessel with a higher CO2 concentration versus the entire atmosphere (or at least the entire room).

If you got condensation on the OUTSIDE of your jars, then your room is way too hot and damp lol

Yes, the mycelium is releasing moisture into the air, both from evaporation off the surface and basic respiration. It's also generating heat. So we expect the air inside the jar to have a higher moisture content. That air hits the cooler walls of the jar, and loses moisture holding capacity, and, bam, condensation. And/or, there's an excess amount of moisture in the jar, the air hits its saturation point, and, bam, there's condensation everywhere.


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Edited by B Traven (08/04/24 01:35 PM)

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OfflineThe Tao
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Re: How exactly does gas exchange work without airflow? [Re: Arctic_Fox]
    #28899931 - 08/04/24 01:38 PM (5 months, 10 days ago)

Quote:

Arctic_Fox said:
Fungus requires oxygen, and produces carbon dioxide. So we put filtered openings in our sealed vessels to allow for gas exchange.

It's counter-intuitive that this works, though. What moves the gases? There is no airflow. There's no convection, no pressure differential, and no turbulence (correct me if I am wrong). Why does any gas move through the threshold?




But when there is a metabolic process occurring that generates heat how would that affect convection, pressure differential, turbulence and gas exchange?
What has to happen?

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OfflineArctic_Fox
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Re: How exactly does gas exchange work without airflow? [Re: The Tao]
    #28899956 - 08/04/24 01:57 PM (5 months, 10 days ago)

Ah, I didn't consider that the colonisation would generate heat. So the heat creates convection currents which moves air out of the jar, which has to be replaced by other air.


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