Answer: conduction

AnswerCrossword Clue
CONDUCTIONHeat transfer, e.g.
conductionThe conveying of fluid through a pipe or other channel
conductionheat transport by direct transfer of energy from one particle to another, without moving the particle to a new location
conductionThe process by which sound waves travel through a medium
conductionThe transmission of impulses along nerves
conductionThe process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material