The electrical conductivity (a in units of Ohm1-cm-1), or reciprocal of the resistivity of a medium is given by where ni, q, and mui, are the density, charge, and mobility of the charge carriers. Making (and stating) appropriate assumptions, estimate the electrical conductivity of a 100 mTorr Ar plasma whose electron density is 1010/cm3 and energy is 2.5 eV. How does this value compare to the conductivity of typical metals and semiconductors?