I got quite confused with the math in Thomas-Fermi's approximation.(adsbygoogle = window.adsbygoogle || []).push({});

I thought it was supposed to approximate a length but the math from a textbook gives energy instead.

I don't understand what is it trying to approximate.

My professor told me that normal conductors screen electric field at a very short distance ≈1 Angstrom. He said that is the Thomas-Fermi approximated length.

How to derive that length?

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# Thomas-Fermi Screening Approximation

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