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Nelson_Obert_Chart.png
Nelson-Obert chart, courtesy San Diego State University. When Tr = 1.00, the temperature is at the critical point, and the compressibility decreases rapidly with increasing pressure. This is the incompressibility of liquids. But above the critical pressure (Pr = 1.00), the plasma is more compressible than predicted by the ideal gas laws, especially at the lower temperatures.

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