Question

heat can be transferred through conduction, convection, and radiation. what is necessary in order for heat to be transferred by conduction?
a. heat must be transferred through space.
b. heat must be transferred in the form of currents.
c. the objects must be in direct contact with one another.
d. the substances must be liquids or gases.

Explanation:

Conduction is the transfer of heat energy by direct contact between particles of a substance. Heat transfer through space is radiation. Heat transfer in form of currents is convection. Liquids or gases are relevant for convection, not conduction.

Answer:

C. The objects must be in direct contact with one another.