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I wonder what kind of pressure we’re talking about to achieve that EV gap.

~2.3 GPa, the max mentioned in the paper, equates to around 20k atmospheres of pressure or around 300k psi.

That seems like an enormous amount of pressure. Can you put that into perspective, please?

Imagine 80 full sized SUVs stacked on top of each other, balanced on a 1” square metal rod.