The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Click equation to show only symbol
first radiation constant†
 $ c_1 = 2{\rmpi}h c^2= \rmpi\, {\rm sr}\,c_{\rm 1L} $
 Numerical value  3.741 771 852...  x 10-16 W m2
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  3.741 771 852... x 10-16 W m2    
†The full description of unit m2 is m-2×(m/cycle)4.
 
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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