For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the ____________ remains constant throughout the period of vaporisation ?
Correct answer: B. Wet bulb temperature
- A. Dry bulb temperature
- B. Wet bulb temperature
- C. Humidity
- D. Relative saturation
Explanation
Adiabatic evaporation into unsaturated air at constant pressure follows an approximately constant wet-bulb temperature path because the sensible heat lost by the air supplies the latent heat of vaporisation. Dry-bulb temperature and humidity therefore change during the process.
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