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"""
"""
from ._utils import _cd
from ..unitquantity import UnitConstant
Z_0 = impedence_of_free_space = characteristic_impedance_of_vacuum = UnitConstant(
'characteristic_impedance_of_vacuum',
_cd('characteristic impedance of vacuum'),
symbol='Z_0',
u_symbol='Z₀'
)
vacuum_permittivity = epsilon_0 = electric_constant = UnitConstant(
'electric_constant',
_cd('electric constant'),
symbol='epsilon_0',
u_symbol='ε₀'
)
mu_0 = magnetic_constant = UnitConstant(
'magnetic_constant',
_cd('magnetic constant'),
symbol='mu_0',
u_symbol='μ₀'
)
del UnitConstant, _cd
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