# The Vacuum Impedance and Unit Systems

@article{Kitano2009TheVI, title={The Vacuum Impedance and Unit Systems}, author={Masao Kitano}, journal={IEICE Trans. Electron.}, year={2009}, volume={92-C}, pages={3-8} }

In the electromagnetic theory, the vacuum impedance Z0 is a universal constant, which is as important as the velocity of light c0 in vacuum. Unfortunately, however, its significance is not appreciated so well and sometimes the presence itself is ignored. It is partly because in the Gaussian system of units, which has widely been used for long time, Z0 is a dimensionless constant and of unit magnitude. In this paper, we clarify that Z0 is a fundamental parameter in electromagnetism and plays…

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