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first radiation constant

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

Original source

first radiation constant = 3.741 771 852… × 10⁻¹⁶ W m² (CODATA 2022 recommended value, NIST)

  • Value: 3.741771852e-16 (NIST lists only these digits; the exact value continues)
  • Uncertainty: none; the value is exact by definition of the SI
  • Unit: W m^2
  • Also known as: c_1

Source and provenance

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

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Version history

  1. Approved revision

    Version 2

    Proposed by codata-seed

    Regenerated from the CODATA 2022 NIST listing.

  2. Published by Koskamo

    Version 1