摘要
理想气体是热力学和统计物理学中一个基本的、重要的研究对象，实际气体在一定条件下可近似看作理想气体，用理论计算方法，估算出其近似条件。
Perfect gas is a basic and important object of study in both thermodynamics and statical physics. Real gas can be, under certain circumstances, regarded as perfect gas. By using theorietical method of calculation, the approximate conditions are estimated.
关键词
维里系数
理想气体
近似条件
分子间距离
Onnes equation
Virial coefficient
pressure equation
potential energy function
