Chemical Engineering - Mass Transfer - Discussion


Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

[A]. higher dew point.
[B]. higher absolute (specific) humidity.
[C]. higher relative humidity
[D]. higher wet bulb temperature.

Answer: Option C


No answer description available for this question.

Mukesh said: (Sep 13, 2013)  
Dew point and absolute humidity remains constant during constant pressure heating and cooling. Wet bulb temp. Decrease for cooling and increases for heating.

Shan Rana said: (Oct 23, 2013)  
The Dew Point temperature can be measured by filling a metal can with water and some ice cubes. Stir by a thermometer and watch the outside of the can. When the vapor in the air starts to condensate on the outside of the can, the temperature on the thermometer is pretty close to the dew point of the actual air.

Surya said: (Aug 17, 2014)  
As the temperature decreases the relative humidity increases.

Avaneesh said: (Oct 18, 2016)  
Temperature decrease of gas then vapour pressures also decrease.

Relative humidity= partial pressure of vapour in water air mixture /vapour pressure of pure water.

Yogesh said: (Sep 14, 2017)  
As the temperature decreases the relative humidity increases.

Prithwijit said: (Dec 5, 2017)  
Warm air can hold more water vapour than cold air. Therefore with decrease of temperature relative humidity increases and vice versa.

Jhj said: (Apr 20, 2018)  
As the temperature decreases the relative humidity increases.

Rajendra Pal said: (Jan 21, 2020)  
RH= actual moisture content divide by capacity to be content in to hundred. Holding capacity vairy according to temperature at low temperature less holding capacity at higher temp higher holding capacity.

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