"AI4QJ" wrote in message
...

"Roy Lewallen" wrote in message
...


AI4QJ wrote:
"Cecil Moore" wrote in message
...
wrote:
Cecil Moore wrote:
Quoting "Alpha and Omega", by Seife,
"Empty space is an incredibly complex substance, ...
Are you saying space is a fluid?
Maybe "an incredibly complex substance"
exhibits some characteristics of a fluid?

I should say "characteristic" impedance is 377 Ohms. It also has a
permitivity and permeability of 1 ;-)

I'm sure you mean relative permittivity and relative permeability.

No, this is not correct. The permitivities and permeabilities of all
materials are relative to free space. Free space is assumed to be 1 and
the other values are relative to it.


The characteristic impedance is the square root of permeability divided
by permittivity, so if both are one, the characteristic impedance would
have to be one.

No, this is not correct.



According to "Reference Data for Radio Engineers", published by
International Telephone and Telegraph, fourth edition, page 35:

"Properties of Free Space"

Permeability = 1.257 * 10^-6 henry per meter.
Permittivity = 8.85 * 10^-12 farad per meter.

Characteristic impedance = sqrt(Permeability/Permittivity) = 376.7 ohms

John

John KD5YI wrote:

According to "Reference Data for Radio Engineers", published by
International Telephone and Telegraph, fourth edition, page 35:

"Properties of Free Space"

Permeability = 1.257 * 10^-6 henry per meter.
Permittivity = 8.85 * 10^-12 farad per meter.

Characteristic impedance = sqrt(Permeability/Permittivity) = 376.7 ohms

John

My earlier citations of reputable sources were denounced as being an
intentional insult. I see that yours is simply being ignored. Perhaps
that's progress?

Roy Lewallen, W7EL