What is the difference between steam isotherms and ideal gas isotherms?

At high temperatures higher than Tc, the vapor isotherm differs from the ideal gas isotherm only by a certain distortion of its shape. As the temperature decreases, the vapor isotherm becomes more and more similar to the graph of the van der Waals gas isotherm. At a certain temperature Tk, the shape of the graph differs significantly from the hyperbola.

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