A Hypothetical Situation Involving Gases

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SUMMARY

This discussion explores the hypothetical scenario of replacing all empty space in the universe with Earth's atmospheric gases while disregarding gravitational effects. Participants emphasize the speculative nature of the question, noting that interstellar space already contains gas, albeit at a much lower density than Earth's atmosphere. Increased density could lead to a higher formation rate of stars and planetary systems, but the resultant mass would likely cause the universe to collapse under significantly greater gravitational forces.

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What would happen if all of the empty space of the universe from the small to the vast, were replaced with the gases that make the Earth's atmosphere while neglecting gravity from any massive object?
 
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This question is so anti-reality speculative that I don't know that any possible answer exists...or, rather, since you're making it up, you may as well just make-up the answer yourself as well. Sorry. Would you like to try to make the question more realistic?
 
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Interstellar space already does contain a lot of gas (and dusty bits of other material), though nothing like as dense as the Earth's atmosphere.
The denser regions are the places where new stars and planets form.
If interstellar space contained a much greater density of stuff, I would expect that many more stars and systems would form then we see.
But then all that additional mass would probably result in a universe which collapses pretty quickly due to the hugely much greater gravity ( as a whole) in it.
 
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