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Invisibleturtlelamp
n00b
Registered: 11/27/03
Posts: 93
Loc: The Midwest
Re: getting rid of CO2 [Re: Anno]
    #2260002 - 01/21/04 01:54 PM (20 years, 30 days ago)

All this talk about air exchange... a question has been nagging me recently. I have an ultrasonic on a timer so that it runs one hour every six. You can see the mist it produces and it's quite a stream. This would be enough to displace any stagnant air or CO2, would it not?


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Offlinegreenplato
boogeyman

Registered: 02/25/01
Posts: 62
Last seen: 15 years, 4 months
Re: getting rid of CO2 [Re: Max1]
    #2260019 - 01/21/04 02:00 PM (20 years, 30 days ago)

Quote:

Max1 said:
This isnt rocket science people. Of cource C02 sinks in an undisturbed closed container. Helium is lighter than air and floats very easily when the 2 are occupying the same space. C02 is heavier there for it must sink.




It floats if you have balloon filled with helium. Likewise, a balloon filled with CO2 will fall to the floor faster than a balloon filled with normal atmospheric air.

But we are not dealing with gas sequestered into balloons. The kinetic energy of the moving gas will cause them to diffuse and evenly distribute in a container under normal conditions in a period of time that is inversely proportional to the mass of the gas molecules.

The mushroom beds are generating additional CO2, which is concentrated at the bottom of the terrarium. If the mushrooms were removed, even without any outside agitation, the gasses would quickly diffuse and mix homogenously. But our mushrooms at the bottom of the terrarium are little CO2 generators. This gives the appearance of the "heavy" CO2 sinking to the bottom, but this is not the case.

Quote:


C02 is so heavy that it can be poured from one container to another straight through the air. 6th grade Science class here people.





When you are dealing with a localized concentration of CO2, you can pour it like a liquid, but this condition will not last long. The movement of the gas molecules is greater that the pull of gravity, so the gas will disperse. Pour some CO2 into a container and see how long it stays there. I'll post some quick calculations to show how weak the force of gravity is compared to the kinetic energy of a gas at room temperature for all to see.

Meanwhile, ponder this example. Open a bottle of perfume or aftershave. You don't smell it immediately but eventually you will. There are two forces at work: the air currents in the room wafting the molecules and the diffusion of the gas. Aromatics, such as the molecules that make perfume and aftershave smell are much heavier than air, or carbon dioxide, but they will still diffuse through the air. Even in a "still" atmosphere, the heavier aromatics will reach your nose in a short period of time. The force of gravity is inconsequential compared to the energy at which they bump around in the air.



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