Question

what happens during conduction?
heat is transferred from warmer objects to cooler objects by moving fluids.
heat is transferred from warmer objects to cooler objects through empty space.
heat is transferred from warmer objects to cooler objects by direct contact.

Explanation:

Heat conduction is the transfer of heat energy through direct contact between particles of a substance. In solids, it occurs mainly through the vibration of atoms and molecules. When a warmer object is in direct contact with a cooler one, the more energetic particles (in the warmer object) collide with the less energetic particles (in the cooler object), transferring some of their kinetic energy (heat). This process continues until thermal equilibrium is reached (both objects are at the same temperature).

Answer:

Heat is transferred from warmer objects to cooler objects by direct contact.