The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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characteristic impedance of vacuum
$Z_0$
 Value  376.730 313 461... OmegaRed
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  376.730 313 461... Omega    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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