但是，当磁铁和磁石的温度升高时，它们内部的分子热运动越来越快。
But, when the temperature of magnetic iron and loadstone goes up, the member heat of their inner part exercises more and more and quickly.
由于分子太小，教学中很难利用现有的技术和仪器直接观察到分子热运动。
Molecule is so small, that it is very difficult to use existing technique and instruments to observe molecular movement.
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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