Basic Laws - Basic Laws of Gases and Particulates 1 Ideal...

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08/12/09 1 Basic Laws of Gases and Particulates Ideal gas law Unit of concentration Vapor pressure & partial pressure Humidity & psychrometric chart Viscosity Aerosol size Aerosol size distribution Settling velocity Brownian motion and diffusion
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08/12/09 2 Ideal Gas Law Other references: 1. CRC Handbook of Chemistry & Physics 2. Perry’s Chemical Engineers’ Handbook T R n Q P T R MW P T R MW M T R n V P = = = = ρ P : pressure V : volume n : mole R : Ideal gas law constant T : Temperature M : mass MW : molecular weight ρ : density Q : volume flow rate : molar flow rate n
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08/12/09 3 Ideal Gas Law Constant 82.057 8.314 8.314 8.314 What is the volume of 1 g-mole of air at 25 o C and 1 atm? How many lb-moles are there for 380 ft 3 of air at 60 o F and 14.7 psi? Avogadro’s number: 6.023 × 10 23 molecules/mole At 1 atm and 25 o C, 1 mole of air has a volume of 24.5 L
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08/12/09 4 Unit of Concentration Is 1 μ g/cm 3 SO 2 equal to 1 ppm SO 2 ? The annual standard of NO 2 is 100 μ g/m 3 . What is the concentration in ppb? Is “ppm” molar basis, volume basis or mass basis? What’s the difference between “ACFM” and “SCFM”? Section 7.1.2
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08/12/09 5 Concentration on a “dry” basis Water vapor is commonly present in a heated gas stream, e.g., combustion of a hydrocarbon fuel.
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