本文首先明确了直自由程的含义，分析了容器壁对分子自由程的影响。
In this paper, the influence of the vessel wall on the distribution of the molecular free paths was analysed.
通常所称的气体分子平均自由程并未计及容器器壁的影响。
In general, in calculating mean free-path of gaseous molecules, the effect of container is not considered.
本文分析了容器对分子自由飞行路程的影响，并拓展了自由程概念。
This article studies the influence of the container on the molecular free flying path and extends the concept of the free path.
几何平均自由程或容器的特征尺度是低压下描述气体分子热运动的重要物理量。
The mean geometric free path or the characteristic dimension of a container is the important physical magnitude in describing the heat motion of gas molecules under low pressure.
几何平均自由程或容器的特征尺度是低压下描述气体分子热运动的重要物理量。
The mean geometric free path or the characteristic dimension of a container is the important physical magnitude in describing the heat motion of gas molecules under low pressure.
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