Question

Which heat transfer mechanism requires molecules to actually touch each other?

Answer 1

Conduction.
Conduction is the process by which heat energy is transmitted through collisions between neighboring molecules.

Answer 2

Conduction

Step-by-step explanation:

Conduction is one of the forms of heat transfer in which the agitation of molecules (due to the increase in temperature) is transmitted from molecule to molecule as they collide until they completely heat up.

A possible example of conduction temperature transfer is when an iron bar is heated by a flame, where iron molecules are heated while the flame transmits energy to the iron bar.