An interesting and tricky thing to contemplate.
If I may observe, in the elastic collisions between Nitrogen and Oxygen atoms momentum will be conserved, so yes, the lighter Nitrogen atoms will rebound at a higher speed than the heavier Oxygen atoms (in the kinetic theory view).
But from gravitational theory, when it comes to vertical motion and collision with or rebound from the Earth surface, there appears to be no difference in the downward or upward speeds of BOTH atoms despite their differing masses making their masses seemingly irrelevant (?weightlessness).
And I may be wrong...
Regards,
Akinbo
That’s true Akinbo,
But let’s consider the kinetic theory model where the molecules are all going every-which-way constantly colliding with the ground as the boundary. Now after each collision, the lighter particle (nitrogen molecule) will on average exit faster than the heavier particle (oxygen molecule) https://en.wikipedia.org/wiki/Elastic_collision#/media/File:Elastischer_sto%C3%9F3.gif . Without a boundary (earth’s surface), it may not matter but because of the earth’s surface existence, I the nitrogen molecules ending up travelling further up due to higher speeds than the oxygen hence causing a composition gradient.
But perhaps it’s not all that measureable, what do you think?
Best, Ian
From: Akinbo Ojo [mailto:ta...@hotmail.com]
Sent: Saturday, May 20, 2017 8:25 PM
To: Roger Munday
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Subject: Re: Composition of the Atmosphere
Yes, you are correct. But there is gravitational attraction between Earth and Nitrogen atom on the one hand, and between Earth and Oxygen atom on the other hand. As a result both may fall at the same rate towards Earth. Hence at each altitude Nitrogen and Oxygen may remain side by side instead of the lighter atom falling slower.
Just a suggestion to resolve the puzzle concerning the relative densities.
Akinbo
From: Roger Munday <munda...@gmail.com>
Sent: Saturday, May 20, 2017 10:35 AM
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Subject: Re: Composition of the Atmosphere
Akinbo,
According to the generally accepted postulates of the kinetic atomic theory of gases there is no gravitational attraction between atoms.
If there were the theory would itself collapse.
Regards,
Roger Munday
On 20 May 2017 at 21:05, Akinbo Ojo <ta...@hotmail.com> wrote:
Ian and All,
Perhaps Galileo's experiment at the leaning tower of Pisa may shed some light...
Release an atom of Nitrogen and another of Oxygen simultaneously from a height, despite Oxygen being slightly more massive, at every altitude as they fall they will remain side by side. This is because in the mutual gravitational attraction between each atom and Earth, the mass cancels out.
Just a thought...
Regards,
Akinbo
From: IMontgomery52Private <imontg...@atlasgas.com.au>
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Subject: RE: Composition of the Atmosphere
Yes Roger,
I just seems that KE theory within a gravitational field just can’t explain why the percentages of air composition don’t change in that 100 km zone, just like why the top bench in a sauna is hotter than the lower.
Best, Ian
From: Roger Munday [mailto:munda...@gmail.com]
Sent: Friday, May 19, 2017 9:43 PM
To: Carl Reiff
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Subject: Re: Composition of the Atmosphere
Carl,
This is simple, basic.
To focus on the lower atmosphere to 100 km altitude that, as stated, is composed of the same proportions of nitrogen and oxygen, which gases of course decrease in density with altitude.
The oxygen component, having a greater mass, should, if the cause of the variation in density is gravity as it must be, accumulate in greater proportions nearer to the surface. But it patently does not, and the textbooks state, in attempts to cover this problem, that in terms of kinetic theory “gravity can be ignored”, while at the same time the kinetic motions of atoms are “perfectly random”.
This and many other problems with this theory are ignored, “Oh - this is elementary stuff”.
Yes it is elementary, it is fundamental to all of theoretical physics, and if this theory cannot describe such simple interactions and completely ignores gravity, then it is about time that people come, literally, down to Earth, and instead of delving deeper and deeper into the complexity and confusion that is evident here on this forum, and indeed in the mainstream, reconsider the fundamentals.
Electron microscopy shows clearly that solid matter is continuous, and this and the liquid state are analysed using continuum mechanics, but of course the mindset is that this is an illusion and the all permeating vacuum ( non-material aether) MUST ‘exist’.
It does not and cannot.
Regards,
Roger Munday
On 19 May 2017 at 15:54, Carl Reiff <cre...@elgenwave.com> wrote:
Ian,
I'm not sure it you are saying that you can't see how a lot of KE would cause that, or how only a little KE would? If a lot, then that makes perfect sense to me, as a lot of mixing would be occurring.
Regards,
Carl
-----------------------------------
On 5/18/2017 8:50 PM, IMontgomery52Private wrote:
Hi Roger,
May well be. But just focussing on the first 100 kms, they seem to be pretty sure there’s no major change of composition and I can’t see how KE would explain that. Can anyone else on this list give a KE explanation?
Best, Ian
From: Roger Munday [mailto:munda...@gmail.com]
Sent: Friday, May 19, 2017 6:57 AM
To: IMontgomery52Private
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Subject: Composition of the Atmosphere
Ian,
Started this new thread, the other was sending detritus.
You wrote:-
Actually, the below begs a question in my mind. I had a look at atmospheric composition verses elevation http://wordpress.mrreid.org/2014/08/01/the-composition-of-earths-atmosphere-with-elevation/ and I notice that the N2 and O2 composition doesn’t change for the first 100 km. With N2 being lighter, one would think that there’d be a steady increase through this 100 km?
Yes, I agree with your point about nitrogen oxygen proportions.
But I note this qualification from your link :-
“It’s important to note that the graphs above all show concentration as a percentage of the total number of particles of gas in the atmosphere, rather than by mass or volume. The atmosphere becomes incredibly thin at high elevations, so that particles of gas may travel many kilometres between collisions, and if absolute concentrations were used instead, the graph would look very different (and be completely unusable, which is why I haven’t included it here).”
And my attempts to get some other estimates of compositions and proportions was not successful, just vague comments, so I wonder how these were experimentally determined in these graphs, any info on this would be appreciated.
And then this:-
“By the time we reach an elevation of 1000?km helium makes up 93% of the atmosphere. This is due to the fact that helium is an unreactive and very light atom (with a mass about one-eighth of oxygen) and thus isn’t held tightly by Earth’s gravitational field. (Helium is so light that it can escape Earth’s gravity entirely.) The bulk of the remainder is hydrogen, also prevalent due to its low mass (about one-sixteenth of oxygen’s).”
So the gases of the atmosphere are governed by the Earth's gravity acting through a vacuum – How?
The failure to explain this invalidates this, and the theoretical necessity of “escape velocity” is therefore also nonsense.
Regards,
Roger Munday
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That’s true Akinbo,But let’s consider the kinetic theory model where the molecules are all going every-which-way constantly colliding with the ground as the boundary. Now after each collision, the lighter particle (nitrogen molecule) will on average exit faster than the heavier particle (oxygen molecule) https://en.wikipedia.org/wiki/ Elastic_collision#/media/File: Elastischer_sto%C3%9F3.gif . Without a boundary (earth’s surface), it may not matter but because of the earth’s surface existence, I the nitrogen molecules ending up travelling further up due to higher speeds than the oxygen hence causing a composition gradient.
Yes Roger,
Actually, the below begs a question in my mind. I had a look at atmospheric composition verses elevation http://wordpress.mrreid.org/ 2014/08/01/the-composition-of- earths-atmosphere-with- elevation/ and I notice that the N2 and O2 composition doesn’t change for the first 100 km. With N2 being lighter, one would think that there’d be a steady increase through this 100 km?
Yes, I agree with your point about nitrogen oxygen proportions.But I note this qualification from your link :-“It’s important to note that the graphs above all show concentration as a percentage of the total number of particles of gas in the atmosphere, rather than by mass or volume. The atmosphere becomes incredibly thin at high elevations, so that particles of gas may travel many kilometres between collisions, and if absolute concentrations were used instead, the graph would look very different (and be completely unusable, which is why I haven’t included it here).”And my attempts to get some other estimates of compositions and proportions was not successful, just vague comments, so I wonder how these were experimentally determined in these graphs, any info on this would be appreciated.And then this:-“By the time we reach an elevation of 1000?km helium makes up 93% of the atmosphere. This is due to the fact that helium is an unreactive and very light atom (with a mass about one-eighth of oxygen) and thus isn’t held tightly by Earth’s gravitational field. (Helium is so light that it can escape Earth’s gravity entirely.) The bulk of the remainder is hydrogen, also prevalent due to its low mass (about one-sixteenth of oxygen’s).”So the gases of the atmosphere are governed by the Earth's gravity acting through a vacuum – How?The failure to explain this invalidates this, and the theoretical necessity of “escape velocity” is therefore also nonsense.Regards,Roger Munday
I don't think the data invalidates the theory at all, on the contrary fully confirms it. Above 200 KM, we see that atomic oxygen which would be half the mass of N^2 clearly dominates showing the expected gravitational separation, even higher, we see that helium and then finally the lightest hydrogen dominate. This is exactly what we would expect. The heavy Oxygen and Nitrogen are concentrated towards the ground. These two have such similar atomic mass, it is not surprising that there would be no detectible separation at the lower levels.-Frankln
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Indeed a good question Roger,
Looking it up, it does as you describe. So these very heavy atoms should just fall without being bumped too much by the N2 and O2 lightweights. What say you Franklin?
Best, Ian
From: Roger Munday [mailto:munda...@gmail.com]
Sent: Tuesday, May 23, 2017 9:53 AM
To: Franklin Hu
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Subject: Re: Composition of the Atmosphere
Franklin,
I don't think the data invalidates the theory at all, on the contrary fully confirms it. Above 200 KM, we see that atomic oxygen which would be half the mass of N^2 clearly dominates showing the expected gravitational separation, even higher, we see that helium and then finally the lightest hydrogen dominate. This is exactly what we would expect. The heavy Oxygen and Nitrogen are concentrated towards the ground. These two have such similar atomic mass, it is not surprising that there would be no detectible separation at the lower levels.-Frankln
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Anything can evaporate with enough energy and if you did an experiment with a sufficiently large laboratory in a cold and still environment, I think you would find that on average, the mercury would find its way towards the bottom of the room. How can you say it would be evenly distributed when you haven't done any such experiment? After all, most of the mercury is already sitting on the floor in a puddle and not floating around the room.Although this whole subject begs the question of why lighter gases rise. People say that gravity is only an attraction, but when you look at a helium balloon, is that attraction? Looks a lot more like repulsion to me. In fact, the force of gravity actually depends upon the material that an object is immersed in, than it being an all attractive force. If I toss you into water, you float up, being repelled from the gravity source.Some say this is due to 'boyancy', but then what is buoyancy? Is it the action of the atoms pushing upwards.I don't think so, the electrostatic theory of gravity suggests that the directional force of gravity depends of the relative permeability of the objects involved. This force can be towards or away from the central charge source. I suggest that the reason why the helium balloon rises is because the atoms inside of the balloon are experiencing an upward force on them due to the different permeability of the surrounding atmosphere. We would see the pushing happening from inside the balloon, not on the outside of the balloon as buoyancy would suggest.So, if you're looking for an explanation for how gases separate in gravity, I would start with explaining how a helium balloon works, rather than try to explain what is going on in the whole atmosphere which appears to have the stratification that one would expect.-Franklin
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Yes Roger,
And I saw this;
Common exposures: When most exposures to metallic mercury occur, they occur because mercury is released from a container, or from a product or device that breaks. If the mercury is not immediately contained or cleaned up, it can evaporate, becoming an invisible, odorless, toxic vapor. Exposures may occur when people breathe this vapor and inhale it into their lungs. Poorly ventilated, warm, indoor spaces are of particular concern in cases of airborne mercury vapors. Note that where metallic mercury generally is contained in glass or metal, it does not pose a risk unless the product is damaged or broken and mercury vapors are released.
It seems that molecules in the air don’t drop unless they liquefy, like rain?
Best, Ian
From: Roger Munday [mailto:munda...@gmail.com]
Sent: Wednesday, May 24, 2017 5:20 AM
To: Franklin Hu
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Subject: Re: Composition of the Atmosphere
Franklin,
You say "the mercury would find its way towards the bottom of the room."
Yes Roger,
Yes, I agree with your point about nitrogen oxygen proportions.
But I note this qualification from your link :-
“It’s important to note that the graphs above all show concentration as a percentage of the total number of particles of gas in the atmosphere, rather than by mass or volume. The atmosphere becomes incredibly thin at high elevations, so that particles of gas may travel many kilometres between collisions, and if absolute concentrations were used instead, the graph would look very different (and be completely unusable, which is why I haven’t included it here).”
And my attempts to get some other estimates of compositions and proportions was not successful, just vague comments, so I wonder how these were experimentally determined in these graphs, any info on this would be appreciated.
And then this:-
“By the time we reach an elevation of 1000?km helium makes up 93% of the atmosphere. This is due to the fact that helium is an unreactive and very light atom (with a mass about one-eighth of oxygen) and thus isn’t held tightly by Earth’s gravitational field. (Helium is so light that it can escape Earth’s gravity entirely.) The bulk of the remainder is hydrogen, also prevalent due to its low mass (about one-sixteenth of oxygen’s).”
So the gases of the atmosphere are governed by the Earth's gravity acting through a vacuum – How?
The failure to explain this invalidates this, and the theoretical necessity of “escape velocity” is therefore also nonsense.
Regards,
Roger Munday
Virus-free. www.avast.com
Carl,
Yes good point, there has to be an ‘explanation’ for this phenomenon, and in the case of mercury the required ‘surface tension’ is, at 487 dyn/cm, five times that of any other liquid.
This is, of necessity, a relatively huge force, but the question is:-
How do the atoms at the surface of the drop generate this force and how does it act between discontinuous atoms that are in kinetic motion in a vacuum?
This is patently inexplicable.
What is described as ‘surface tension’ is of course an observed effect, and obviously the mass of mercury atoms are far greater than those of other liquids and accordingly any potential attractive force will be proportionate.
This, and any other surface effect, can be simply explained by assuming a continuity of atomic matter where liquids and gases are in contact, for example the surface of water where the cohesion, the mutual attraction, between the atoms of the water are greater than those of the atmospheric gases.
And, in smaller quantities, water acts in the same way as mercury, for example where spherical droplets accumulate on a leaf.
With a continuum of mercury atoms the inter-atomic attraction is, due to their greater masses, much greater than other liquids and of course this mutual attraction can act throughout the droplet, and this, logically, can form a near perfect sphere, (i.e. distorted slightly at the point of contact with the supporting surface) and thus present a high level of ‘surface tension’.
Regards,
Roger Munday
Yes Roger,
Very strong cohesive forces as also evidenced by mercury’s famous reverse meniscus, so how do those light bombs heading down cause the mercury atoms to escape up when it won’t even climb a glass wall like water does?
"This video claims to show mercury giving off a steady stream of toxic vapor when viewed with a UV light."
Amazing video Roger,
That mercury vapour (which I checked has a density to air ratio of 6.92) just nice and easily drifts up. And you don’t wonder about this, Franklin?
Best, Ian