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