fine-structure constant

Document v2 · published by Koskamo · updated 2026-10-04

fine-structure constant = 7.297 352 5643 × 10⁻³ (CODATA 2022 recommended value, NIST)

Value: 7.2973525643e-3
Standard uncertainty: 1.1e-12 (relative 1.5 × 10⁻¹⁰)
Unit: none (dimensionless)
Also known as: Sommerfeld constant; alpha

Source and provenance

Original source: physics.nist.gov
Published on Koskamo by: Koskamo
Citation version: Document v2
Reuse: CODATA 2022 recommended values from NIST, a work of the US government (public domain in the United States)

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Version history

Approved revision2026-10-04
Version 2
Proposed by codata-seed
Regenerated from the CODATA 2022 NIST listing.
Published by Koskamo2026-10-03
Version 1