173_AtmChem_Lect6_foweb

173_AtmChem_Lect6_foweb - 173: Lecture6...

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173 : Atmospheric Chemistry Lecture 6: FP-P 2 : The Atmospheric System  (‘The Atmospheric Chemical Reactor’) [email protected]
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Last Day Recap: Old concepts (air quality, smog,  acid rain) and new (ozone hole,  global warming) issues Questions?
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Note: trace constituents reach into thousands!
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Terminology (FP-P 2.D :  Concentrations and  Standards) When considering gas phase species it is  common to specify in terms of (1)  concentration or mixing ratio (2) number  per unit volume and (3) mass per unit  volume.  (1) Number of GAS molecules in question  per molecules of AIR : ‘concentration’ or  ‘mixing ratio’ e.g. parts per million (ppm), ppb, ppt  ( NOT thousand as for isotopes! )
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This is a volume mixing ratio via  PV=nRT Same as molecules per unit volume?  No – P change with altitude (you may  see ‘ppm v:v’. How does water vapor affect this?
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This note was uploaded on 10/28/2010 for the course CHEM 173 taught by Professor Dr.dancziczo during the Spring '10 term at UC Riverside.

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173_AtmChem_Lect6_foweb - 173: Lecture6...

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