Constants & Units · constant
Vacuum electric permittivity
ε₀ = 8.854 187 8188(14) × 10⁻¹² F m⁻¹
- Unit
- F m⁻¹
- Value
- 8.854 187 8188(14) × 10⁻¹²
- Exact
- no
- Note
- How strongly the vacuum resists an electric field. Exact before 2019; now measured, via α.
- Symbol
- ε₀
- Category
- Electromagnetic
- Numeric
- 8.8541878188e-12
- Uncertainty
- ±1.6 × 10⁻¹⁰ relative
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