Automobile windscreens often develop a fog on the inside of the glass. To remove

Question

Automobile windscreens often develop a fog on the inside of the glass. To remove this fog, most cars have vents under the windscreen that will blow air on the inside of the windscreen. What temperature should you select when blowing air on the inside of the windscreen to effectively remove the fog? Select one: a. cold air b. hot air c. the temperature of the air is irrelevant when removing this fog. Below are the temperature (T) and dewpoint temperature (Td) for 4 cities. Which city has the highest vapor pressure? City A: T = 88 degree F, Td = 68 degree F City B: T = 49 degree F, Td = 48 degree F City C: T = 109 degree F, Td = 55 degree F City D: T = 29 degree F, Td = 22 degree F Select one: a. City A b. City B c. City C d. City D

Explanation / Answer

1. Answer :b Explanation : hot air from canopy vent effectively removes fog and manages the air conditioning systems. 2.answer :c Explanation : saturation vapor pressure is the maximum vapor pressure attained when dew point equals air temperature. Therefore the maximum value of the difference between the air and dew point temperature is the one which has more vapor pressure.

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