1# -*- coding: utf-8 -*- 2""" 3""" 4from __future__ import absolute_import 5 6from ._utils import _cd 7from ..unitquantity import UnitConstant 8 9 10Z_0 = impedence_of_free_space = characteristic_impedance_of_vacuum = UnitConstant( 11 'characteristic_impedance_of_vacuum', 12 _cd('characteristic impedance of vacuum'), 13 symbol='Z_0', 14 u_symbol='Z₀' 15) 16vacuum_permittivity = epsilon_0 = electric_constant = UnitConstant( 17 'electric_constant', 18 _cd('electric constant'), 19 symbol='epsilon_0', 20 u_symbol='ε₀' 21) 22mu_0 = magnetic_constant = UnitConstant( 23 'magnetic_constant', 24 _cd('magnetic constant'), 25 symbol='mu_0', 26 u_symbol='μ₀' 27) 28 29 30del UnitConstant, _cd 31