Question

which of the following is the best description of conduction?
a. the process of changing from a gas to a liquid or from a liquid to a gas
b. the transmission of heat through a medium without the motion of the medium
c. heat transfer in a gas or liquid by the circulation of currents from one region to another
d. the emission of energy in the form of rays or waves that can travel through empty space

Explanation:

To determine the best description of conduction, we analyze each option:

• Option A describes phase changes (condensation/evaporation), not conduction.
• Option B: Conduction is heat transfer through a medium (solid, liquid, or gas) where the medium itself doesn't move (e.g., heat through a metal rod). This matches conduction.
• Option C describes convection (heat transfer via fluid currents).
• Option D describes radiation (heat transfer via electromagnetic waves).

Answer:

B. the transmission of heat through a medium without the motion of the medium