this post was submitted on 13 Dec 2024
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The short version: It's the Pauli Exclusion Principle.
6 paragraphs from the end of the article they actually get to the point.
Electrostatic repulsion is also an indispensable component, so the answer obviously isn’t that short.
To quote the article;
"The Pauli Exclusion Principle doesn’t only explain why matter is solid, but also why it occupies the amount of space that it does. Again: it isn’t just the uncertainty principle and electrostatic repulsion that’s responsible for volume; if matter were made of bosons, it wouldn’t occupy space in the same fashion that it does when it’s made of fermions"