Fundamental Physical Constants Catalog
Physical constants of nature in SI units — the speed of light, Planck constant, elementary charge, and more — each flagged as defined-exact (post-2019 SI redefinition) or measured, with its relative standard uncertainty. Every row is read live at build time from OnlyCSharp.Data.Catalogs.PhysicsAndAstronomy.FundamentalConstants.FundamentalConstants.AllConstants. Authored as .razor; rendered to static HTML.
Sources: CODATA recommended values of the fundamental physical constants (via NIST, U.S. Government public domain, 17 U.S.C. §105) and the 2019 SI base-unit redefinition (exact defining constants). Wikipedia article slugs cross-checked per-entry. See the leaf PROVENANCE.
| Symbol | Name | Value (SI) | Unit | Kind | Rel. uncertainty | Wikipedia |
|---|---|---|---|---|---|---|
| c | speed of light in vacuum | 299792458 | m/s | exact | 0 (defined) | Speed_of_light |
| h | Planck constant | 6.62607015E-34 | J·s | exact | 0 (defined) | Planck_constant |
| ħ | reduced Planck constant | 1.05457182E-34 | J·s | exact | 0 (defined) | Planck_constant |
| e | elementary charge | 1.60217663E-19 | C | exact | 0 (defined) | Elementary_charge |
| k | Boltzmann constant | 1.380649E-23 | J/K | exact | 0 (defined) | Boltzmann_constant |
| N_A | Avogadro constant | 6.02214076E+23 | /mol | exact | 0 (defined) | Avogadro_constant |
| g0 | standard acceleration of gravity | 9.80665 | m/s² | exact | 0 (defined) | Standard_gravity |
| R | molar gas constant | 8.31446262 | J/(mol·K) | exact | 0 (defined) | Gas_constant |
| σ | Stefan-Boltzmann constant | 5.67037442E-08 | W/(m²·K⁴) | exact | 0 (defined) | Stefan-Boltzmann_constant |
| eV | electron volt | 1.60217663E-19 | J | exact | 0 (defined) | Electronvolt |
| G | Newtonian constant of gravitation | 6.6743E-11 | m³/(kg·s²) | measured | 2.2E-05 | Gravitational_constant |
| m_e | electron mass | 9.1093837E-31 | kg | measured | 3E-10 | Electron_mass |
| m_p | proton mass | 1.67262192E-27 | kg | measured | 3.1E-10 | Proton |
| μ0 | vacuum magnetic permeability | 1.25663706E-06 | N/A² | measured | 1.5E-10 | Vacuum_permeability |
| ε0 | vacuum electric permittivity | 8.85418781E-12 | F/m | measured | 1.5E-10 | Vacuum_permittivity |
| α | fine-structure constant | 0.00729735257 | (dimensionless) | measured | 1.5E-10 | Fine-structure_constant |