We can use other equations of state for more accurate

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We can use other equations of state for more accurate calculations Critical pressure (PC) – the highest pressure at which a species can coexist in two phases Critical Temperature – the highest
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1/27/11 For water,TC=374.15 and PC=218.3 atm
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1/27/11 Critical Conditions Vapor – gaseous species below its critical temperature Gas – species above its critical temperature at a pressure low enough for the species to be more like a vapor than a liquid You can compress a vapor isothermally until it condenses . A gas will get more dense, but never
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1/27/11 Example The critical temperature and pressure of isopropanol are 508.8 K and 53.0 atm. Isopropanol is in a gaseous state at 400 K and 1 atm. Is it a vapor or a gas? Vapor If isopropanol at 550 K and 1 atm is compressed isothermally to 100 atm,
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1/27/11 PVT Diagram - astr.gsu.edu/HBASE/thermo/pvtsur.html#c1
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1/27/11
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1/27/11 Cubic EOS Other EOS, which when expanded yield cubic equations for specific volume Van der Waals EOS was the first: This term accounts for attractive forces between molecules This term is a correction factor accounting for the volume of the molecules
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1/27/11
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1/27/11 Empirical EOS Remember all empirical EOS are merely approximations from experimental data Experimental measurements is still the most accurate way to get PVT data Error from an EOS will be greater if the problem lies outside the T and P ranges for which the data were
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1/27/11 Compressibility Factor EOS The compressibility factor is defined by the following equation:
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