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Homework Help: Relationship of vapour pressure and Dew Point

  1. Apr 1, 2014 #1
    1. The problem statement, all variables and given/known data
    Moist air at 32 degrees C has a dew point of 26 degrees C. The total or atmospheric pressure
    is 100.7kPa.

    find the:
    Molal Humidity
    Relative Humidity
    2. Relevant equations
    Molal Humidity = [itex]\frac{P_{i}}{P_{tot} - P_{i}}[/itex]
    Relative Humidity = [itex]\frac{P_{i}}{P_{vap}}[/itex]

    3. The attempt at a solution
    I'm thinking I can simply sub in the vapour pressure for the dew point (looking at a pressure table) straight in as the partial pressure for molal humidity.

    I got an answer of 3.45%, using equation for molal humidity. I have no answers for this particular question, so I'm not sure if this is correct.
  2. jcsd
  3. Apr 1, 2014 #2
    Looks correct.

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