# Default Pint constants definition file
# Based on the International System of Units
# Language: english
# Source: http://physics.nist.gov/cuu/Constants/Table/allascii.txt
# :copyright: 2013 by Pint Authors, see AUTHORS for more details.

speed_of_light = 299792458 * meter / second = c
standard_gravity = 9.806650 * meter / second ** 2 = g_0 = g_n = gravity
vacuum_permeability = 4 * pi * 1e-7 * newton / ampere ** 2 = mu_0 = magnetic_constant
vacuum_permittivity = 1 / (mu_0 * c **2 ) = epsilon_0 = electric_constant
Z_0 = mu_0 * c = impedance_of_free_space = characteristic_impedance_of_vacuum

# 0.000 000 29 e-34
planck_constant = 6.62606957e-34 J s = h
hbar = planck_constant / (2 * pi) = ħ

# 0.000 80 e-11
newtonian_constant_of_gravitation = 6.67384e-11 m^3 kg^-1 s^-2

# 0.000 000 035 e-19
# elementary_charge = 1.602176565e-19 C = e

# 0.000 0075
molar_gas_constant = 8.3144621 J mol^-1 K^-1 = R

# 0.000 000 0024 e-3
fine_structure_constant = 7.2973525698e-3

# 0.000 000 27 e23
avogadro_number = 6.02214129e23 mol^-1 =N_A

# 0.000 0013 e-23
boltzmann_constant = 1.3806488e-23 J K^-1 = k

# 0.000 021 e-8
stefan_boltzmann_constant = 5.670373e-8 W m^-2 K^-4 = σ

# 0.000 0053 e10
wien_frequency_displacement_law_constant = 5.8789254e10 Hz K^-1

# 0.000 055
rydberg_constant = 10973731.568539 m^-1

# 0.000 000 40 e-31
electron_mass = 9.10938291e-31 kg = m_e

# 0.000 000 074 e-27
neutron_mass = 1.674927351e-27 kg = m_n

# 0.000 000 074 e-27
proton_mass = 1.672621777e-27 kg = m_p