Transport Properties of Condensed Matter

PACS 66 covers the study of how particles, energy, and charge move through solids and liquids, including electrical conductivity, thermal conductivity, viscosity, diffusion, and related phenomena. It addresses experimental techniques, theoretical models, and material-specific behavior that determine transport coefficients in metals, semiconductors, insulators, superconductors, and complex fluids. This category links microscopic mechanisms to macroscopic performance in condensed-matter systems.