In reply to David Jonsson's message of Thu, 29 Jan 2009 01:43:20 +0100: Hi, [snip] >Hi > >Please tell me how to calculate the permittivity, the electrical constant ? >and the permeability, magnetic constant ?, in a gas with some net charge. >There are no free electrons. The gas is made from diatomic molecules. [snip] I have no idea, but I suspect it would be quite a complicated calculation, and also depend on density of the gas. Actually I'm not sure it's even possible to create a gas with a significant net charge, so you might consider air at STP as a reasonable starting point, in which case the relevant relative constants are close to 1 (IOW treat it as a vacuum).
Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html

