Вплив температури та тиску на термодинамічний коефіцієнт (∂V/∂T)p води

• Datum: 2023
• Hauptverfasser: Bulavin, L.A., Rudnikov, Ye.G.
• Format: Artikel
• Sprache: English; Ukrainian
• Veröffentlicht: Publishing house "Academperiodika" 2023
• Schlagworte: вода; аргон; коефiцiєнт об’ємного розширення; крива спiвiснування рiдина–пара; крива спiвiснування рiдина–тверде тiло; водневi зв’язки
• Online Zugang: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2023039
• Назва журналу: Ukrainian Journal of Physics

On the basis of literature data, the temperature and pressure dependences of the thermodynamic coefficient (∂V/∂T)P for liquid water have been calculated and analyzed. The obtained results are compared with the relevant data for argon. Taking the principle of corresponding states into account, the existence of a region, where the thermodynamic similarity between water and argon takes place, is confirmed. At the same time, there is a region, where the indicated similarity is not observed, and the thermodynamic properties of water demonstrate a peculiar behavior. In particular, an inflection point at a temperature of (91.0 ± 0.2 )∘C is observed in the temperature dependence of the curve (∂V/∂T)P for water, but not for argon, along the liquid-vapor equilibrium curve. The existence of inflection point in the dependence (∂V/∂T)P for water leads to the presence of negative values of (∂V/∂T)P at temperatures below 3.98∘C, as well as to the intersection of the temperature dependences of isobars (∂V/∂T)P in water at a temperature of (42 .0 ± 0 .2 )∘C. On the contrary, the temperature dependences of the curves (∂V/∂T)P for argon along the liquid-vapor equilibrium curve do not have a corresponding inflection point.