What is the density in atoms per unit volume of most nebulas?

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SUMMARY

The density of most nebulae is approximately a few hundred atoms per cubic centimeter, which is significantly less dense than the best vacuums achievable on Earth. This information highlights the sparse nature of nebulae, providing a clearer understanding of their composition and structure. Observing from within a nebula would likely result in minimal visibility due to this low density of particles.

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dav2008
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Or is it Nebulae...anyways

What is the density in atoms per unit volume of most nebulas? I am just looking for a rough estimate to help me picture it..

And what would it look like if u were inside one..would u even see anything?
 
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Good question with an interesting answer.
excerpt from http://itss.raytheon.com/cafe/qadir/q1929.html

"density of only a few hundred atoms per cubic centimeter, most nebula are better then the best vacua we can make on the earth"
 
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