Outer envelopes of neutron stars consist mostly of fully ionized, strongly
coupled Coulomb plasmas characterized by typical densities rho similar to 1
0(4)-10(11) g cm(-3) and temperatures T similar to 10(4)-10(9) K. Many neut
ron stars possess magnetic fields B similar to 10(11)-10(14) G. Recent theo
retical advances allow one to calculate thermodynamic functions and electro
n transport coefficients for such plasmas with an accuracy required for the
oretical interpretation of observations.