Nucleation - Gas-To-Particle Conversion Reading: Chap 13.5...

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09/13/11 Aerosol & Particulate Research Laboratory 1 Gas-To-Particle Conversion Q: What’s the interaction between gas molecules and particles? VOC Water vapor Activated Carbon Water droplet Q: How do we have the first particle for vapor condensation? ==> Condensation ==> Nucleation Q: Examples? Q: Examples? Reading: Chap 13.5
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09/13/11 Aerosol & Particulate Research Laboratory 2 Vapor Pressure The pressure required to maintain a vapor in equilibrium with the condensed vapor (liquid or solid) with a flat surface at a specified temperature T C B A T P v + - = ) ( log P v in mmHg and T in o C (if Table 9.2 is used) (Saturation) Vapor Pressure Time to reach equilibrium How does vapor pressure change if the temperature increases?
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09/13/11 Aerosol & Particulate Research Laboratory 3
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09/13/11 Aerosol & Particulate Research Laboratory 4 What is the vapor pressure of water at 20 o C? If the measurement is conducted on Mars (the atmospheric pressure is about 0.006 atm), what will be the value?
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09/13/11 Aerosol & Particulate Research Laboratory 5
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09/13/11 Aerosol & Particulate Research Laboratory 6 Partial Pressure : the pressure that a gas (or vapor) in a mixture of gases would exert if it were to occupy the entire volume occupied by the mixture T A A P y P = ) 100 ( ) ( × = = S RH T P P S v A Supersaturation: S > 1 ( RH > 100%) Saturation Ratio (or relative humidity for water) Q: After a rain at dusk, the temperature starts to drop. How do P V and P A change correspondingly? How about S ? Can you 1 mole of O 2 @ 1 atm 4 moles of N 2 Q: How much is P O2 ? Adiabatic Expansion, Mixing, Cooling, Speciation change by Gas Phase Reaction Q: What would happen if S > 1?
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Nucleation - Gas-To-Particle Conversion Reading: Chap 13.5...

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