新的应用于氧和氮的全区域状态方程

建立了一个新的全区域状态方程，将其表示成温度和密度函数的亥姆霍兹自由能形式。新状态方程克服了以前状态方程不能全区域计算热物理性质的缺陷，尤其在临界区的数学困难，它是截至目前唯一能够适应于液相区、气相区、饱和区、临界区的热力性质计算的全区域方程，并将其应用于氧和氮的热力性质呈现．本文给出的氧的状态方程能精确适用于温度低至三相点、温度高达３００Ｋ，密度高达３倍临界密度的宽广范围；氮的状态方程温度高达３５０Ｋ，新方程式不仅能准确呈现温度、密度、压力关系式，而且还能满意地给出其它导出热力性质，诸如比热容和音速，最后，给出了新状态方程与实验数据的比较偏差。

NEW GLOBAL EQUATIOS OF STATE FOR THE THERMODYNAMIC PROPERTIES OF OXYGEN AND NITROGEN

The new global equations of state for oxygen and nitrogen based on the global equationof state established by the authors and recent experimental data are presented. All the ther-modynamic properties,including pressure-density-temperature properties,isochoric and iso-baric heat capacities,and speeds of sound for the temperatures from the triple point to 300Kfor oxygen and to 350K for nitrogen,and densities up to three times the critical density in thevapor phase,in the liquid phase,in the coexsistence curve, and in the critical region can be de-scribed with high accuracy.