Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with decrease in wet bulb temperature
And dehumidified with increase in wet bulb temperature
At the same relative humidity
And humidified

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Total pressure is less
Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Saturated steam is used for steam distillation

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