"Cecil Moore" wrote in message
t...
art wrote:
I am aware that the impedance of a particular
atmosphere is 377 ohms but that is certainly not a ratio.
From: http://whatis.techtarget.com/definit...845268,00.html
Mathematically, the Zo of free space is equal to the square root of the
ratio of the permeability of free space (ľo) in henrys per meter (H/m) to
the permittivity of free space (o) in farads per meter (F/m):
Zo = (ľo/o)1/2
= [(1.257 x 10-6 H/m)/(8.85 x 10-12 F/m)]1/2
= 377 ohms (approximately)
The exact value of the Zo of free space is 120 pi ohms, where pi is the
ratio of the circumference of a circle to its diameter.
--
73, Cecil, w5dxp.com
Also the ratio of E/H. [(V/m)/(A/m)] = [ohms].
Frank