- The transmission of energy through a medium without the medium itself moving as a whole. Electrical, acoustic, or heat energy may be propagated in this manner. For instance, the transmission of electrical energy through a metal entailing the migration of electrons through the conductor. This contrasts with convection, where the medium itself is moved, and with radiation, where waves or particles are emitted.
- The flow of electrical charge through a medium. This may entail, for instance the movement of electrons through a metal conductor, or the migration of ions in a gas. Also called electrical conduction.
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