Question

the temperature at which humid air must be cooled to become saturated is known as?
○ absolute humidity
○ dew point
○ relative humidity

Explanation:

To solve this, we recall the definitions:

• Absolute humidity: mass of water vapor per volume of air.
• Relative humidity: ratio of actual to saturation vapor pressure.
• Dew point: temperature at which humid air becomes saturated (condensation starts) when cooled.

The question asks for the temperature at which humid air must be cooled to become saturated, which matches the definition of dew point. Absolute humidity and relative humidity are measures of moisture content, not temperatures.

Answer:

The option with "dew point" (the middle option among the three).