c = 2.998 × 10⁸ m/s
h = 6.626 × 10⁻³⁴ J⋅s
e = 1.602 × 10⁻¹⁹ C

mₑ = 9.109 × 10⁻³¹ kg
k = 1.381 × 10⁻²³ J/K
σ = 5.670 × 10⁻⁸ W/(m²⋅K⁴)