The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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characteristic impedance of vacuum
 $ Z_0 = \sqrt{\mu_0/\epsilon_0} = \mu_0c$
 Numerical value  376.730 313 412 OmegaRed
 Standard uncertainty    0.000 000 059 Omega
  Relative standard uncertainty  1.6 x 10-10
 Concise form  376.730 313 412(59) Omega    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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