The temperature to which air must be cooled in order to become saturated is the:

The correct answer is: B. Dew point temperature

The dew point temperature is the temperature at which the air is saturated with water vapor. This means that the air cannot hold any more water vapor and any additional water vapor will condense into liquid water. The dew point temperature is important because it is a measure of the humidity of the air. The higher the dew point temperature, the more humid the air is.

The other options are incorrect because:

• The minimum temperature is the lowest temperature that air can reach.
• The wet-bulb temperature is the temperature of a thermometer that is covered with a wet cloth. The wet-bulb temperature is always lower than the air temperature because the water on the cloth evaporates, taking heat away from the thermometer.
• The freezing point is the temperature at which water freezes.