Gene Fuller wrote:
Voltage is often poorly defined since it requires a
reference.

Yes, and the web page reference provided a well defined
reference between two electrodes with known capacitance.
There is *always* a relationship between electric field
strength and voltage. I disagree that they are unrelated
as you implied.

I don't see how ionization could occur at
zero volts which you seem to imply is a possibility.

Huh?? Did I say that?

No, but you implied it when you said "ionization threshold
has *nothing* to do with voltage". Nothing is zero so you
implied an ionization threshold is completely unrelated and
independent of volts. Do you want to amend that statement?
Maybe: "The relationship between field strength and voltage
is sometimes difficult to determine."?
--
73, Cecil, http://www.qsl.net/w5dxp