When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ?
Correct answer: D. The relative humidity decreases
- A. The partial pressure of water vapour increases
- B. The specific humidity decreases
- C. The relative humidity increases
- D. The relative humidity decreases
Explanation
At constant pressure without adding moisture, the water-vapour partial pressure and humidity ratio remain approximately constant, while saturation pressure rises as temperature increases. Relative humidity therefore decreases because it is the ratio of actual to saturation vapour pressure.
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