# AOS145_HW03 - AOS 145 Homework#3 Winter 2017 Li Due Name ID...

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AOS 145 Homework #3 Winter 2017 – Li Due 2/8/2017 Name:____________________________ ID: ________________________________ 2 QUESTIONS (16 points total) 1. An air mass containing dry particles of pure ammonium sulfate ((NH 4 ) 2 SO 4 ) is lifted in the atmosphere to a level where the environment saturation ratio is 1.002. The particles have the following size distribution: a) [4 point] Above which dry diameter will the particles be activated and grow? In solution ammonium sulfate dissociates into three ions. The molecular weight and density of ammonium sulfate is 132 g mol -1 and 1.77 g cm -3 , respectively. Assume temperature T = 273 K in your calculation. b) [2 point] Discuss qualitatively how the size distribution will look like after some time has elapsed. c) [2 point] Discuss qualitatively what will happen if, after 5 minutes, the environment saturation drops to 1.001. Hints: A dry diameter can be calculated from n s or vice versa (see the last slide from Lecture 6). Once the particle takes up water, its diameter will change which follows the Köhler curve.

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