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# physics.stackexchange › questions › 318814 Electrical conductivity of plasmas - Physics Stack Exchange

What is the electrical conductivity (or resistance) of plasmas? I have seen sources mentioning that some plasmas have conductivity in the same order of magnitude as copper or steel and others mentioning that it can be though as infinite, i.e. they are superconductors.Electrical Conductivity 84 4 Stochastic Processes in a Plasma loss per unit time. τcoll is the mean free time between two collisions deﬁned in Eq. (4.15).Electrical conductivity or specific conductance is the reciprocal of electrical resistivity, and measures a material’s ability to conduct an electric current. The electrothermal instability (also known as the ionization instability) is a magnetohydrodynamic (MHD) instability appearing in magnetized non-thermal plasmas used in MHD converters.Plasma is called the fourth state of matter after solid, liquid, and gas. It is a state of matter in which an ionized substance becomes highly electrically conductive to the point that long-range electric and magnetic fields dominate its behaviour.The evaluation of the conductivity tensor, when the contributiondue to the motion of the ions is included, can be performed in astraightforward way. The linearized Langevin equation is solvedfor all the particles and the total conductivity tensor is simply S = S X (32) Plasma as a dielectric mediumCurrent flowing along the magnetic field is subject to Ohm’s law with the usual value of the conductivity. In plasmas located in a magnetic field this ordinary conductivity is called the longitudinal conductivity. The transverse conductivity is smaller than the conductivity in the direction of the magnetic field. Conductivity of plasma.

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