What physicists are basically doing is making the collisions as powerful and as efficient as possible to turn particle mass into pure energy (as a result of Einstein's bedrock equation E=mc2).
Because this gas liquid coexistence line, this diagram, and this Clapeyron equation, is all done for a pure substance.
因为这个共存曲线，相图和克拉珀龙方程，都是对纯物质得到的。
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And then we'll have an equation that will compare the chemical potential of the mixture under the same conditions as the chemical potential of a in the pure state.