<blockquote>
  <p>Why does the pressure increase only by 0,3-0,4bar per km in stone but 1bar per 10m in water while stone has the higher density?</p>
</blockquote>

<h2>Because it doesn't!</h2>

<p>Plots in <a href="https://physics.stackexchange.com/a/184039/83380">this Physics SE answer</a> and <a href="https://www.researchgate.net/figure/The-pressure-at-different-depths-in-the-Earths-interior_fig12_228377528" rel="nofollow noreferrer">here</a> and <a href="https://www.researchgate.net/figure/The-pressure-inside-the-Earth-as-a-function-of-depth-The-data-are-taken-from-the_fig2_320302392" rel="nofollow noreferrer">here</a> show about 0.4 or 0.5 <span class="math-container">$\times 10^6$</span> bar at 1000 km depth, which is 0.4 or 0.5 bar <em>per meter</em> compared to your 0.1 bar per meter for water. If rock is 4 to 5 times denser than water, then all is well.</p>

CC BY-SA 4.0
2020-06-11T11:12:14.843Z
2020-06-11T11:12:14.843Z
uhoh
<p>Why does the pressure increase only by 0,3-0,4bar per km in stone but 1bar per 10m in water while stone has the higher density?</p>

CC BY-SA 4.0
2020-06-10T04:52:21.367Z
It's been a long time since I was involved with this, but look at co-efficient of earth pressure & how a proportion of vertical stresses dissipates into horizontal stresses. As I recall it has something to do with how grains of minerals with the rocks (& soil) transfer stresses.
Fred
CC BY-SA 4.0
2020-06-11T11:13:49.750Z
@Fred [tell me more](https://earthscience.stackexchange.com/a/19822/6031)!
uhoh
<geology>
Pressure Increase in stone and in water
questiontag
# Pressure Increase in stone and in water

(Asked by: username_0 on 2020-06-09)

Why does the pressure increase only by 0,3-0,4bar per km in stone but 1bar per 10m in water while stone has the higher density?

**Tags:** geology

> **Comments:**
> **username_1**: It's been a long time since I was involved with this, but look at co-efficient of earth pressure & how a proportion of vertical stresses dissipates into horizontal stresses. As I recall it has something to do with how grains of minerals with the rocks (& soil) transfer stresses.  
> **username_2**: @username_1 [tell me more](https://earthscience.stackexchange.com/a/19822/6031)!  

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## 1 answers

### Answer by username_2 on 2020-06-11. Score: 3

> Why does the pressure increase only by 0,3-0,4bar per km in stone but 1bar per 10m in water while stone has the higher density?

## Because it doesn't!

Plots in [this Physics SE answer](https://physics.stackexchange.com/a/184039/83380) and [here](https://www.researchgate.net/figure/The-pressure-at-different-depths-in-the-Earths-interior_fig12_228377528) and [here](https://www.researchgate.net/figure/The-pressure-inside-the-Earth-as-a-function-of-depth-The-data-are-taken-from-the_fig2_320302392) show about 0.4 or 0.5 $\times 10^6$ bar at 1000 km depth, which is 0.4 or 0.5 bar *per meter* compared to your 0.1 bar per meter for water. If rock is 4 to 5 times denser than water, then all is well.


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