Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a____________________?
Correct answer: C. Higher relative humidity
- A. Higher dew point
- B. Higher absolute (specific) humidity
- C. Higher relative humidity
- D. Higher wet bulb temperature
Explanation
Cooling unsaturated air at constant pressure leaves its humidity ratio nearly unchanged until saturation, while the saturation capacity falls. Thus, the relative humidity increases even though the dew point and absolute humidity do not increase.
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