Constants & Units · constant
Characteristic impedance of vacuum
Z₀ = 376.730 313 412(59) Ω
- Unit
- Ω
- Value
- 376.730 313 412(59)
- Exact
- no
- Note
- The vacuum's resistance to electromagnetic waves — why antennas are matched to ~377 Ω.
- Symbol
- Z₀
- Category
- Electromagnetic
- Numeric
- 376.730313412
- Uncertainty
- ±1.6 × 10⁻¹⁰ relative
Open on the Constants & Units shelf — the interactive card, the filters, and everything alongside it.