the square root Z0 of the magnetic constant μ0 divided by the electric constant ε0
NOTE – In the International System of units (SI), the characteristic impedance of vacuum is equal to:
Z0 = c0 · 4π × 10−7 H/m
c0 being the velocity of electromagnetic waves in vacuum; Z0 is approximately equal to 120π Ω or 377 Ω.
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