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Phase transitions are in the focus of the modeling of multiphase flows. Alarge number of models is available to describe such processes. We considerseveral different two phase models that are based on the Euler equations ofcompressible fluid flows and which take into account phase transitions betweena liquid phase and its vapor. Especially we consider the flow of liquid waterand water vapor. We give a mathematical proof, that all these models are notable to describe the process of condensation by compression. This behavior isin agreement with observations in experiments, that simulate adiabatic flows,and shows that the Euler equations give a fairly good description of theprocess. The mathematical proof is valid for the official standard {\emIAPWS-IF97} for water and for any other good equation of state. Also theopposite case of expanding the liquid phase will be discussed.

Why condensation by compression in pure water vapor cannot occur in an approach based on Euler equations