Wednesday, September 10, 2008

TE 303 - HW #2, P8 - Relative Humidity and Fogged Glasses - 8 pts

The Campus Police heard that you were a thermodynamics guru, so they have come to you to help figure out if a witness to a crime is credible. The eyewitness claims that upon entering her apartment complex, she saw the suspect leaving the downstairs apartment with some electronics equipment. Since the eyewitness must wear glasses and stated that she was wearing them at the time, the Campus Police want to know if her glasses would have fogged up when entering the building and thus obstructed her view. The temperature of the apartment complex was measured to be 20 °C, and the outdoor temperature to be 10oC. A humidity gauge indicated that the relative humidity in the apartment complex is 55%. Assuming that the eyewitness did not have anti-fog lenses, do you think that this eyewitness could have been obstructed by fogged lenses? Provide supporting calculations.

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