Which statement about the dew point is correct according to the content?

• A. The temperature at which the first refrigerant in a blend turns to liquid
• B. The temperature at which air becomes saturated
• C. The temperature at which a liquid boils
• D. The temperature at which the system stops condensing

Answer: (A)

Dew point is the temperature at which air becomes saturated with water vapor and condensation begins. At that temperature, the air can’t hold any more moisture in vapor form, so water starts to condense on surfaces. That’s why this statement is the correct definition: it directly ties dew point to saturation of water vapor in the air.

The other descriptions refer to different concepts. One describes a phase change for a refrigerant blend, not atmospheric humidity. Another describes the boiling point of a liquid, which is not the same as the dew point. The last idea about stopping condensation isn’t how dew point works, since condensation occurs when air reaches or falls below the dew point and can continue as conditions change.