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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