Which component is associated with the refrigerant changing from vapor to liquid?

• A. Condenser
• B. Evaporator
• C. Compressor
• D. Expansion valve

Answer: (A)

In the vapor‑compression cycle, the change from vapor to liquid happens when the hot, high‑pressure refrigerant gas is cooled and releases heat to its surroundings. That heat rejection and condensation occur in the condenser, which is the heat‑rejection stage of the cycle. After the refrigerant is compressed into a high‑pressure gas, it flows into the condenser where it cools and becomes a liquid. The evaporator does the opposite by absorbing heat and turning liquid into vapor; the expansion valve lowers pressure to allow liquid to begin vaporizing before entering the evaporator; the compressor then raises the pressure of the vapor to keep the cycle going. So, the condenser is the component where the refrigerant changes from vapor to liquid.