Lecture_5 - Lecture 5 States on P T and P V diagrams It's...

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Lecture 5 — States on PT and PV diagrams It’s easier to visualize slices of the PV T surface. PT , PV , and V T diagrams. Each have their uses. PV diagram A projection of the full PV T diagram onto the PV plane. (“Look down the T axis with one eye closed.”) (sketch) Useful when we want to focus on controlling P and the response in V at fixed T . Features visible in the PV diagram include: Solid, liquid, gas phases, easily identifiable from their di ff erent molar volumes. Transitions between phases: sublimation; melting; boiling. Tie lines connecting coexisting phases with di ff erent V at the same P . Triple point, at which three phases coexist. Critical point, at which coexisting liquid and gas phases become identical (same V ). Isotherms, along which liquid compresses a little as P increases, and gas compresses a lot. Special isotherm at T c , with inflection point. PT diagram This view is useful when we want to focus on the quantities we control ( P and T ), and let the system worry about what the molar volume is going to be. Looks very di
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