Conduction



[kuh n-duhk-shuh n] /kənˈdʌk ʃən/

noun
1.
the act of conducting, as of water through a pipe.
2.
Physics.

3.
Physiology. the carrying of sound waves, electrons, heat, or nerve impulses by a nerve or other tissue.
/kənˈdʌkʃən/
noun
1.
the transfer of energy by a medium without bulk movement of the medium itself: heat conduction,, electrical conduction,, sound conduction Compare convection (sense 1)
2.
the transmission of an electrical or chemical impulse along a nerve fibre
3.
the act of conveying or conducting, as through a pipe
4.
(physics) another name for conductivity (sense 1)
n.

1530s, “hiring;” 1540s, “leading, guidance,” from Old French conduction “hire, renting,” from Latin conductionem (nominative conductio), noun of action from past participle stem of conducere (see conduce). Sense of “conducting of a liquid through a channel” is from 1610s; in physics, of heat, etc., from 1814.

conduction con·duc·tion (kən-dŭk’shən)
n.
The transmission or conveying of something through a medium or passage, especially the transmission of electric charge or heat through a conducting medium without perceptible motion of the medium itself.
conduction
(kən-dŭk’shən)
The transfer of energy, such as heat or an electric charge, through a substance. In heat conduction, energy is transferred from molecule to molecule by direct contact; the molecules themselves do not necessarily change position, but simply vibrate more or less quickly against each other. In electrical conduction, energy is transferred by the movement of electrons or ions. Compare convection. See also radiation.

Our Living Language : Heat is a form of energy that manifests itself in the motion of molecules and atoms, as well as subatomic particles. Heat energy can be transferred by conduction, convection, or radiation. In conduction heat spreads through a substance when faster atoms and molecules collide with neighboring slower ones, transferring some of their kinetic energy to them. This is how the handle of a teaspoon sticking out of a cup of hot tea eventually gets hot, though it is not in direct contact with the hot liquid. When a fluid is heated, portions of the fluid near the source of the heat tend to become less dense and expand outward, causing currents in the fluid. When these less dense regions rise, cooler portions flow in to take their place, which are then themselves subject to heating. This current flow is called convection. Many ocean currents are convection currents caused by the uneven heating of the ocean waters by the Sun. Radiation transmits heat in the form of electromagnetic waves, especially infrared waves, which have a lower frequency than visible light but a higher frequency than microwaves. Atoms and molecules in a substance struck by such radiation readily absorb the energy from these waves, thereby increasing their own kinetic energy and thus the temperature of the substance.

Transfer of energy through a medium (for example, heat or electricity through metal) without any apparent change in the medium.

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  • Conduction analgesia

    conduction analgesia n. The pharmacological deactivation of sensory nerves in a portion of the body.

  • Conduction anesthesia

    conduction anesthesia n. Regional anesthesia in which a local anesthetic solution is injected about the nerves to inhibit nerve transmission. Also called block anesthesia.



  • Conduction aphasia

    conduction aphasia n. A form of aphasia in which there is ability to speak and write but words are skipped, repeated, or substituted for one another. Also called associative aphasia.

  • Conduction band

    noun 1. See energy band conduction band The electron orbital or orbitals, generally the outermost orbitals, in atoms in a conductor or semiconductor, in which the electrons are free enough to move and thereby carry an electric current. Compare valence band. See also bandgap.



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