What is the primary difference between "boiling" and "condensation"?

The primary difference between boiling and condensation lies in their phases of matter and the direction of the phase change involved. Boiling is the process by which a liquid transitions to a vapor when it is heated to its boiling point. During this process, energy is added to the liquid, causing its molecules to gain enough kinetic energy to overcome intermolecular forces and escape into the vapor phase.

Condensation, on the other hand, is the process where vapor transitions back to a liquid. This occurs when vapor loses energy, typically through cooling, and the molecules slow down enough that the intermolecular forces can pull them back into the liquid phase.

Therefore, the correct choice accurately reflects these fundamental physical changes. Recognizing the significance of temperature and energy transfer in both processes enhances the understanding of phase changes, which are crucial in various applications within power engineering.