SLec3 - Lecture 3: Real Gases Last time, we have introduced...

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Lecture 3: Real Gases Last time, we have introduced the ideal gas law, P V = n R T (left figure) Today, we will discuss real gases When coupling of molecules is included, liquids and solids emerge. The systems can be represented by phase diagrams , such as that shown above (H 2 O). follow this isotherm - different points on the surface are different equilibrium states
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Below the critical temperature T c the liquid phase emerges and may coexist with the gas phase (depending on P and V ) At T c , we can find the critical point , where the two phases start to coexist. Here the substance has the critical volume V c and the critical pressure P c Important features in the phase diagrams - existence of different phases - coexistence regions of the phases
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The Lennard-Jones (12,6) potential energy (coupling of molecules) is The molecules repel each other when they are close and attract each other when they are far. Interactions between the molecules
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SLec3 - Lecture 3: Real Gases Last time, we have introduced...

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