Stefan-Boltzmann constant. σ. 5.6704 × 10 -5 g s -3 K -4. electron charge. e. 4.8032 × 10 -10 cm3/2 g1/2 s -1. electron mass. me. 9.1094 × 10 -28 g. 0.511 MeV/c 2.
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