I have a little more to add to this post about the assertion that electromagnetic force dominates over gravity in neutral hydrogen regions ..
Quote:
Originally Posted by Jarvamundo
See conclusions section
Quote:
|
"The importance of electro-magnetic forces cannot be overstated; even in neutral hydrogen regions (10^-4 parts ionized) the electromagnetic force to gravitational force ratio is still 10^7"
|
It appears plasma is defined by the "dominant" force, in this case electro-magnetic, over the gravitational force. These seems very logical no? We do not need to look for the percentage of ionisation, rather what is the dominant force that governs the behavior of the matter in study.
This gem of a historical reference paper is also where the "99.999% of matter by volume is in plasma state." is described
Hope this may help.
Best,
A |
The "dominant force point" made by Alex based on the Peratt et al paper, depends very much on the mass density and temperature of the region in question.
We cannot leave this point assuming that the generalised statement made in the paper, applies everywhere.
The "dominant force" will vary, depending on the region in question, due to recombination-of-charge-effects in the cloud/region.
Once again .. shades of grey.
Cheers