446_01c_hw1 - 3 Ammonium sulfate Forms 2 NH 4 and 1 SO 4...

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Metr 446 Homework # 1 Due Tuesday, September 11 1. Assume that all of the aerosol particles in the air are exactly the same size, and are composed of either pure NaCl, pure (NH 4 ) 2 SO 4 , or pure NH 4 NO 3 . As these aerosols enter a cloud, only one type turns into cloud droplets, because the peak supersaturation in the cloud is less than the critical supersaturation of the other types of aerosols. Which aerosol type formed the cloud droplets? Useful data: Sodium chloride: Forms 1 Na + and 1 Cl - ions, ρ = 2.165 g/cm
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Unformatted text preview: 3 Ammonium sulfate: Forms 2 NH 4 + and 1 SO 4 2-ions, ρ = 1.76 g/cm 3 Ammonium nitrate: Forms 1 NH 4 + and 1 NO 3-ions, ρ = 1.725 g/cm 3 2. Explain mathematically why an aerosol particle can never activate (form a cloud droplet) when the relative humidity is less than 100%. (hint: consider critical supersaturation) 3. What is the smallest spherical pure NaCl aerosol that will activate in a cloud that has a peak supersaturation of 0.1% (typical of stratocumulus clouds)....
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