GATE ME 2017 Set 2 — Question 15
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Thermodynamics → Refrigeration & Air Conditioning → Sensible Heating & Cooling
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Question
If a mass of moist air contained in a closed metallic vessel is heated, then its
Correct answer
(A) relative humidity decreases
Solution
In a closed vessel, the mass of dry air and the mass of water vapor remain constant. Therefore, the specific humidity (humidity ratio) remains constant. As the air is heated, its temperature increases. The saturation pressure of water vapor increases with temperature. Relative humidity is defined as:Since the partial pressure of water vapor remains constant (due to constant mass and volume) and increases, the relative humidity must decrease.
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