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TYPICAL COMPOSITION OF AIR

TYPICAL COMPOSITION OF AIR. UNITS OF PRESSURE. BOURDON PRESSURE GAUGE. TEMP SCALES. GAS DENSITIES. PV = nRT n = m/M (m = Mass of Gas; M = Molar Mass of Gas) ∴ PV = m/MRT ∴ m/V=d gas = PM/RT (d gas = Density of gas). GAS MIXTURES .

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TYPICAL COMPOSITION OF AIR

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  1. TYPICAL COMPOSITION OF AIR

  2. UNITS OF PRESSURE

  3. BOURDON PRESSURE GAUGE

  4. TEMP SCALES

  5. GAS DENSITIES PV = nRT n = m/M (m = Mass of Gas; M = Molar Mass of Gas) ∴ PV = m/MRT ∴ m/V=dgas= PM/RT (dgas = Density of gas)

  6. GAS MIXTURES • Dalton’s Law of Partial Pressures: • pa + pb + pc + pd + ……+ pn = ptotal • ∴ptot = ntot RT/ V

  7. GAS MOL FRACTIONS Mol fraction of A =xA= mols A / total mols For 2 gases A & B, mol fraction of B = xB = nB / (nA + nB) and pB = xBPtot xa + xb + xc + xd …. xn = 1.0

  8. GAS KINETIC THEORY • Pressure = k(Collision/s) x (momentum change) =k (N/V) x u2 where u2 =Mean square velocity of gas molecules Or, PV = Nmu2

  9. GAS COLLISIONS WITH CELL WALLS

  10. Maxwell- Boltzmann Distribution

  11. GAS MOLECULE PATH

  12. DEVIATIONS FROM IDEAL GAS LAW

  13. REAL GASES • Van der Waals Forces • (P + a n2/ V2 ) (V-b) = nRT • “Stickiness” of molecules - a n2/ V2 • Dead Volume of molecules - V-b

  14. Van der Waals constants

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