Planck constant

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

Planck constant = 6.626 070 15 × 10⁻³⁴ J Hz⁻¹ (CODATA 2022 recommended value, NIST)

Value: 6.62607015e-34
Uncertainty: none; the value is exact by definition of the SI
Unit: J Hz^-1

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)

The original source supplies the underlying information. Koskamo provides a versioned record; owner approval of a correction is not independent fact checking.

Keep the unit and stated uncertainty with the value. Records marked exact differ from measured values. The CODATA release is identified in the source; the document update date records publication on Koskamo.

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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