Cooling moist air in a closed system leads to an increase in relative humidity because the saturation vapour pressure decreases with temperature, while the actual water vapour content remains constant (or decreases if condensation occurs).
If a mass of moist air in an airtight container is cooled down to a lower temperature then - (1) dew point temperature decreases - (2) dew point temperature increases - (3) relative humidity increases - (4) relative humidity decreases - (5) Question not attempted
Asked in Assistant Eng. (Mechanical) Competitive Examination, 2023 · Topic: Heat and Thermodynamics (Modes of Heat Transfer (Conduction, Convection, Radiation))
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