
Concept explainers
Interpretation: For 25% humidity and temperature 30 oC, the water vapor density needs to be determined.
Concept Introduction:
The relative humidity is related to water vapor density as follows:

Answer to Problem 7E
Explanation of Solution
The maximum water vapor density can be seen from the water vapor density vs. temperature graph.
It can be seen from the graph that the water vapor density is approximately 1.7 moles/1000L at 30 oC. This corresponds to 100% humidity.
The relative humidity is related to water density as follows:
The given relative humidity is 25% thus,
On rearranging,
Thus, the water vapor density at 30oC is
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