Stefan-Boltzmann constant

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

Stefan-Boltzmann constant = 5.670 374 419… × 10⁻⁸ W m⁻² K⁻⁴ (CODATA 2022 recommended value, NIST)

Value: 5.670374419e-8 (NIST lists only these digits; the exact value continues)
Uncertainty: none; the value is exact by definition of the SI
Unit: W m^-2 K^-4
Also known as: Stefan constant

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