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从正则系综的基本公式出发，推导出一个简单的高压贮气罐内压力与环境温度的关系式，从而绕开了对位形积分的具体计算。该关系式计算结果与实验结果相比误差很小。在工程热力学中利用此公式，可以节省大量的实验时间。
Based on the basic formula of canonical ensemble, the relation between pressure and ambient temperature in a simple high-pressure gas tank is deduced, so as to bypass the concrete calculation of configuration integral. The relationship between the calculated results and the experimental results compared to small errors. Using this formula in engineering thermodynamics can save a lot of experimentation time.