The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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Wien wavelength displacement law constant
 $b$
 Numerical value  2.897 771 955...  x 10-3 m K
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  2.897 771 955... x 10-3 m K    
The full description of unit m is meter per cycle.
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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