electron mass in u

Document v1 · published by Koskamo · updated 2026-10-03

electron mass in u = 5.485 799 090 441 × 10⁻⁴ u (CODATA 2022 recommended value, NIST)

Value: 5.485799090441e-4
Standard uncertainty: 9.7e-15 (relative 1.8 × 10⁻¹¹)
Unit: u

Source and provenance

Original source: physics.nist.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
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

Published by Koskamo2026-10-03
Version 1