Explanation The relative humidity of air at a particular temperature is the measure of the percentage of water present in the surroundings. The pressure outside the building at 5 °C is same as the saturated vapor pressure of the water at this temperature. According to table 18.2, the saturated vapor pressure of water at 5 °C is 872 Pa . The same amount of water that is present outside the building goes inside the building at constant pressure. So, the partial pressure of water inside the building is same as the saturated vapor pressure outside the building. Now the temperature of the room rises to 20 °C and according to table 18.2, the saturated vapor pressure of water at 20 °C is 2330 Pa . Write the expression for the relative humidity of the building. R . H . = ( P H 2 O P Saturated ) 100 % (I) Here, R . H

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Chapter 18, Problem 38P

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The relative humidity of the building at 20 °C.

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Chapter 18 Solutions

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The relative humidity of the building at 20 °C .

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