'''
Planck constant [J s]
'''
.h = 6.62607015e-34
'''
Dirac constant (ħ = h/2π) [J s]
'''
.ħ = 1.054571817e-34
'''
Velocity of light [m s^-1]
'''
.c = 2.99792458e+8
'''
Electric constant [F m^-1]
'''
.ε_0 = 8.8541878128e-12
'''
Magnetic constrant [N A^-2]
'''
.μ_0 = 1.25663706212e-6
'''
Standard gravity [m s^-2]
'''
.g = 9.80665
'''
Gravitational constant [m^3 kg^-1 s^-2]
'''
.G = 6.67430e-11
'''
Fine structure constant [dimensionless]
'''
.α = 7.2973525693e-3
'''
Bolzmann constant [J K^-1]
'''
.k_B = 1.380649e-23
'''
Avogadro constant [mol^-1]
'''
.N_A = 6.02214076e+23
'''
Rydberg constant [m^-1]
'''
.R_inf = 10973731.568160