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首页> 外文期刊>Journal of Physical and Chemical Reference Data >New Equations for the Sublimation Pressure and Melting Pressure of H_2O Ice Ih
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New Equations for the Sublimation Pressure and Melting Pressure of H_2O Ice Ih

机译：H_2O冰Ih的升华压力和融化压力的新方程

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摘要

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 H_2O and the equation of state of H_2O ice Ih adopted by IAPWS in 2006, making them thermodynamically consistent with the bulkphase 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.
机译：提出了国际水和蒸汽特性协会（IAPWS）所采用的新参考方程式，用于将冰的升华压力和融化压力Ih作为温度的函数。这些方程是基于IAPWS-95流体H_2O热力学性质科学标准与IAPWS在2006年采用的H_2O冰Ih状态方程之间的相平衡条件得出的输入值，从而使它们在热力学上与体相特性保持一致。与以前的IAPWS公式（根据经验对实验数据进行拟合）相比，新公式的不确定性小得多。升华压力方程涵盖了从50K到273.16K的气液固三点的温度范围。 Ih冰的融化压力方程描述了从273.16K到Ih–ice III –液态三点在251.165 K处的整个融化曲线。为完整起见，我们还给出了IIII的IAPWS融化压力方程，对其进行了稍微调整以便与相应三点处的冰Ih熔化压力方程式以及冰V，冰VI和冰VII的不变IAPWS熔化压力方程式一致。

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