<p>from <a href="https://link.springer.com/article/10.1007/s11214-020-00660-3/figures/3" rel="nofollow noreferrer">this</a> graph, it looks like it should be around 20000km from the center. So it is about 0.8 radius.</p>
<p>However, I cannot imagine this is correct. The pressure is probably only a few bar at that height. And it is mainly hydrogen. How can the hydrogen at this pressure has density of 1g/cm^3? Even considering the low temperature it has there, it is still impossible.</p>
<p>Can anyone explain this to me?</p>

CC BY-SA 4.0
2023-10-15T18:32:31.283Z
Why do you say "only a few bar".  This graph would suggest a pressure of about 400 bar at that depth https://www.researchgate.net/figure/Uranus-and-Neptune-pressure-profiles-as-a-function-of-normalized-radius_fig3_231059682
James K
CC BY-SA 4.0
2023-10-16T05:52:52.030Z
Why don't you follow the links in the image description? They link to papers who model it. The arxiv.org versions are freely accessible
planetmaker
CC BY-SA 4.0
2023-10-16T08:04:54.133Z
I’m voting to close this question because the OP just appears to disagree with published data for no apparent reason.
Rory Alsop
CC BY-SA 4.0
2023-10-18T09:39:16.693Z
@JamesK thanks, my bad, somehow i miss read the axes of the pressure vs radius in another paper
Wang
<neptune>
what is the pressure in Neptune where the density reach 1g/cm^3?
Wang
# what is the pressure in Neptune where the density reach 1g/cm^3?

(Asked by: username_0 on 2023-10-15)

from [this](https://link.springer.com/article/10.1007/s11214-020-00660-3/figures/3) graph, it looks like it should be around 20000km from the center. So it is about 0.8 radius.

However, I cannot imagine this is correct. The pressure is probably only a few bar at that height. And it is mainly hydrogen. How can the hydrogen at this pressure has density of 1g/cm^3? Even considering the low temperature it has there, it is still impossible.

Can anyone explain this to me?

**Tags:** neptune

> **Comments:**
> **username_1**: Why do you say "only a few bar".  This graph would suggest a pressure of about 400 bar at that depth https://www.researchgate.net/figure/Uranus-and-Neptune-pressure-profiles-as-a-function-of-normalized-radius_fig3_231059682  
> **username_2**: Why don't you follow the links in the image description? They link to papers who model it. The arxiv.org versions are freely accessible  
> **username_3**: I’m voting to close this question because the OP just appears to disagree with published data for no apparent reason.  
> **username_0**: @JamesK thanks, my bad, somehow i miss read the axes of the pressure vs radius in another paper  

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