Cool find!
So Earth gravity is adding 25% to Earth’s density (4.4 → 5.5).
To my non-expert intuition that’s a gigantically big multiplier when you consider how incompressible most of Earth’s materials are. And that some of the stiffest densest stuff is where the pressures are greatest.
Which raises an interesting thought …
Earth’s gravity is highest at the surface and decreases as you go down towards the center whereat gravity is zero. The pressure goes up monotonically as you descend because there’s an ever-increasing pile of stuff above you pressing down. Given the various densities of the stuff, from atmosphere to ocean to crustal rock to mantle rock to core materials, the pressure should increase at different rates at different depths as those two factors play off against each other.
So how does the pressure vary by depth? Here’s what I found after just a bit of reading:
This wiki has some informative graphs on density and gravity by depth, but not one of pressure. Here’s a pressure graph, but with the X-axis reversed vs the wiki graphs. There’s a distinct bump in the rate of pressure increase as you transition from the mantle into the outer core. And the declining gravity isn’t really a factor until you’re very close to the center.
Cool! Still surprised it’s worth 25% though.