Describe what water vapor isotherms look like at temperatures close to room temperature.

With isothermal compression of steam, at first its pressure increases approximately according to a hyperbolic law, in accordance with the Mendeleev-Clapeyron equation. When the volume of steam reaches a certain value, its pressure stops changing, because the steam becomes saturated. With a further decrease in volume, condensation begins. Gradually, all the steam will turn into liquid and then the pressure rises sharply.

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