常温下空气配分函数的计算

Calculation of the Partition Function of the Air at Normal Temperature

给出常温范围内空气的配分函数及其计算方法.考虑到常温范围内空气主要成分为氧气和氮气,从两种气体的平动配分函数及其内部配分函数出发,将氧气和氮气的内部总配分函数拟合成一个关于温度T的四阶多项式,并求出5个系数,根据5个系数可准确求出氧氮分子在常温范围内任意温度时刻下的内部总配分函数.最后通过混合理想气体体系配分函数表达式获得理想空气的配分函数.

The partition function of the air and its calculation method are given at normal temperature. As the main part of the air is nearly made up of oxygen and nitrogen, we start at their translation and internal partition functions. The internal partition sums of oxygen and nitrogen molecules are fit for four-order polynamial expression with T at normal temperature, and the coefficient is evaluated in the five temperature regions. This model provides a rapid and accurate calculation of the total internal partition functions at normal temperature. Finally, the calculation result of partition function of the air was given with the parti- tion function expression of the mixed air.