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Lecture_3_090208 - Lecture 3 September 2 2008 State...

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Page 1 of 5 Lecture 3 – September 2, 2008 State Functions and Variables Perfect Gas Law is an Equation of State, f (p, V, T, n) = 0 p, V, T, and n are then called state variables state variables can be intensive or extensive intensive variable - magnitude of the variable does not depend on the size or amount of the system extensive variable - magnitude of the variable does depend on the size or amount of the system Intensive Extensive Temperature (T) Mass (m) Pressure (P) Volume (V) Dielectric constant ( ε ) Number of Moles (n) Density ( ρ = m/V) Energy (U) Molar Mass (M = m/n) Enthalpy (H) Molar Volume ( V = V/n) Entropy (S) Isothermal Compressibility ( κ = V -1 ( V/ p) T ) Isobaric (C p ) and Isochoric (C v ) Heat Capacities Expansion Coefficient ( α = V -1 ( V/ T) p ) Gibbs (G) and Helmholz (A) Free Energies Molar Quantities - Extensive quantities divided by the total number of moles in the system are themselves intensive quantities
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