Phase diagram of a saturated fluid

✍ Scribed by Albrecht Elsner

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 658 KB
• Volume: 30
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(90)90158-9

✦ Synopsis

To construct the phase diagram of a saturated fluid, it is necessary to have, on the one hand, a set of temperature data for the vapour pressure and for the vapour and liquid densities and, on the other, thermodynamic relations in the form of equations and inequalities interrelating relevant parameters. Absolute energy and entropy values allow the construction of uniquely transformable phase diagrams. The values of the temperature, pressure, volume, internal energy and entropy at the critical point are To, Pc, Vc, 0 and {3~'c + In[vc/(~cVqc)] ]k, and at absolute zero they are O, O, vlo, -[~1o + (Uv -Ul)o] and O, where ~c-VcPc/(kTc) denotes the compression factor and Vqc-h3/(27rmkTc) 3/2 the quantum volume at the critical point, V=o the volume and e~o the zero point energy of the liquid, and (Uv-U~)o the evaporation energy at absolute zero; h is the Planck constant, k the Boltzmann constant and m the particle mass.