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3. Useful constants
Electron mass: m = 9.107 × 10 –31 kg.
Electron charge: e = 1.602 1 × 10 –19 C.
Stefan-Boltzmann constant: σ = 5.669 × 10 –12 W/cm 2 · K 4 .
Boltzmann constant: k = 1.381 × 10 –23 J/ K.
Ratio of proton mass to electron mass: 1,836.
Energy associated with 1eV: E = 1.602 × 10 –19 J = 23.06 Kcal.
Speed of the 1ev electron: v 0 = 5.931 × 10 5 ...
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Useful constants
Molecular density
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