Data:CODATA Recommended Values of the Fundamental Physical Constants 1973
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| Quantity | Symbol | Value | ur |
|---|---|---|---|
| Permeability of vacuum (magnetic constant) | μ0 | 4π × 10−7 H m−1 ≈ 1.256637061… × 10−6 H m−1 |
exact |
| Speed of light in vacuum | c0 | 2.997 924 58(1.2) × 108 m s−1 | 4 × 10−9 |
| Permittivity of vacuum (electric constant) | ε0 = (μ0c20)−1 | 8.854 187 82(7) × 10−12 F m−1 | 8 × 10−9 |
| Fine structure constant | α = μ0c0e2/2h |
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