What is the definition of conduction?

1. Thermal Conduction

Thermal conduction is the transfer of heat energy through an object or from one object to an adjacent object. It is caused by the transfer and dissipation of kinetic energy from one atom to surrounding atoms when the atoms are in close proximity, such as in a solid or liquid. An example is putting a spoon in a cup of hot tea - the handle of the spoon becomes warm even though the handle itself is not in direct contact with the tea. Heat has been conducted from the tea into the scoop end of the spoon, and then though the spoon up to the handle.

Conduction can occur between substances (as in from hot tea to a spoon) or within a single substance (as in dissipate down the length of the spoon).

Iron (Fe) is an example of a good thermal conductor. Heat can transfer through an iron object quickly.

2. Electrical Conduction

Electrical conduction is the flow of free electrons through a substance with very low impedance (resistance) to the movement of those electrons. The uniform flow of electrons gives rise to the movement of electric charge, creating an electric current. In electrical conduction, free electrons pass through the conducting material without changing the ionic balance (the charge) of the conducting substance's atoms and/or molecules.

Copper (Cu) is an example of an electrical conductor, that allows free electrons to pass through a copper cable with minimal impedance.

One definition of the word conduction is "the process by which sound waves travel through a medium."