New Equations for the Sublimation Pressure and Melting Pressure of H2O Ice Ih

作者：Wagner Wolfgang^*; Riethmann Thomas; Feistel Rainer; Harvey Allan H

来源：Journal of Physical and Chemical Reference Data, 2011, 40(4): 043103.

DOI：10.1063/1.3657937

• ice Ih
• ice III
• ice V
• ice VI
• ice VII
• melting-pressure equation
• sublimation-pressure equation
• water

New reference equations, adopted by the International Association for the Properties of Water and Steam (IAPWS), are presented for the sublimation pressure and melting pressure of ice Ih as a function of temperature. These equations are based on input values derived from the phase-equilibrium condition between the IAPWS-95 scientific standard for thermodynamic properties of fluid H2O and the equation of state of H2O ice Ih adopted by IAPWS in 2006, making them thermodynamically consistent with the bulk-phase properties. Compared to the previous IAPWS formulations, which were empirical fits to experimental data, the new equations have significantly less uncertainty. The sublimation-pressure equation covers the temperature range from 50K to the vapor-liquid-solid triple point at 273.16K. The ice Ih melting-pressure equation describes the entire melting curve from 273.16K to the ice Ih-ice III-liquid triple point at 251.165 K. For completeness, we also give the IAPWS melting-pressure equation for ice III, which is slightly adjusted to agree with the ice Ih melting-pressure equation at the corresponding triple point, and the unchanged IAPWS melting-pressure equations for ice V, ice VI, and ice VII. [doi: 10.1063/1.3657937]

• 出版日期2011-12