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Fluffy clouds XD - pressure n height

  1. May 10, 2009 #1
    1. The problem statement, all variables and given/known data

    Puffy cumulus clouds, which are made of water droplets, occur at lower altitudes in the atmosphere. Wispy cirrus clouds, which are made of ice crystals, occur only at higher altitudes. On a typical day and at altitudes less than 11km
    the temperature at an altitude y, can be given by T = To - Alpha*y
    where To = 24.0 degrees celcius and Alpha = (6.00/1000m)

    Find the altitude y(measured from sea level) above which only one cirrus clouds can occur

    express your answer numberically in kilometers, using three significant figures.

    2. Relevant equations

    the ones above

    3. The attempt at a solution

    No idea really how to approach the problem
    but i know it includes phase transition?
    anyone care for a good ol explanation? XD cheers
  2. jcsd
  3. May 10, 2009 #2
    should i use the law of an ideal gas?
  4. May 10, 2009 #3
    Bah didn't read the question properly, it was bloody easy

    it says the the cirrus clouds are made of ice crystals so i assumed the temperature was
    0 degrees celcius

    solving with the formula given i got 4000m or 4km high up is where cirrus clouds form
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