The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
Topics:
Values
Energy
Equivalents
Searchable
Bibliography
Background
Constants
Bibliography
Constants,
Units &
Uncertainty
home page
[skip navigation]
alpha particle mass in u
 $m_{\rm \alpha}$
 Numerical value  4.001 506 179 127 u
 Standard uncertainty  0.000 000 000 063 u
  Relative standard uncertainty  1.6 x 10-11
 Concise form  4.001 506 179 127(63) u    
 
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

 
Go to a new search