Thanks for your input I don t want to compare plasmas to wave particle duality but to the fact that plasmas exhibit a wave aspect that can be modelled with MHD and a particle aspect when an electric current passes through it and MHD fails Sure the electric current can be neglected in many models especially when dealing with MHD and waves But as soon as you get for example filamentation and double layers then the electric current must be taken explicitly into account We could link non Maxwellian to the Maxwell Boltzmann distribution page but it would be nice to express in a word or two what this really means In other words how is it significant and what does it mean True double layers do not require a current and are produced between any adjacent plasma regions with different properites Plasma instabilities formed when an electric current flows through them can have their own characteristics For example fluids can produce a Kelvin Helmholtz instability including plasmas but pass an electic current through a plasma and it can produce a diocotron instability which looks remarkably like a Kelvin Helmholtz instability but is produced in a different way and has unique characteristics If you want to have a go at tidying up the table page please go ahead I can provide you with some addition information if you want to contact me by email details at 22 20 2005 Jun 11 GMT