If a certain mass of moist air in an air tight vessel is heated to a higher temperature, then

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UPPSC AE Mechanical 2013 Official Paper II
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  1. Specific humidity of the air increases
  2. Specific humidity of the air decreases
  3. Relative humidity of the air increases
  4. Relative humidity of the air decreases

Answer (Detailed Solution Below)

Option 4 : Relative humidity of the air decreases
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Explanation:

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If the dry bulb temperature is increased, then it's compulsory that the relative humidity will decrease, since the saturation pressure increase.

When the temperature is increased, the specific humidity (w) is constant.

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