Units and Constants

Abstract

The currently accepted values for the physical constants are listed in Table 1.1, based on the 2002 CODATA (Committee on Data for Science and Technology) recommendations [1.1]. The quoted values are based on all data available through 31 December 2002, and replace the earlier 1998 CODATA set. Because the uncertainties are correlated, the correlation matrix, given in Table 1.2, must be used in calculating uncertainties for any quantities derived from those tabulated [1.1].

Table 1.1 Table of physical constants. Uncertainties are given in parentheses

Table 1.2 The correlation coefficients of a selected group of constants based on the 2002 CODATA [1.1]