Useful constants
Very low-pressure gas

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/cm² · 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: v₀ = 5.931 × 10⁵ m/s.

Temperature associated with 1eV: T₀ = 11,605 K.

Molar gas constant: R = 8.314 J/ K · mol.

Faraday: 1 F = 96,487 C.

Avogadro's constant: N_A = 6.022 × 10²³ mol^–1.

Standard volume of perfect gases: V = 22 414 cm³ .