The mean geometric free path or the characteristic dimension of a container is the important physical magnitude in describing the heatmotion 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。
2
As an object heats up it radiates heat, but it also generates an electric field near its surface as a result of the random thermal motion of its atoms.
物体温度升高后就会辐射出热量，但由于原子的无规则热运动，在物体表面附近还会产生电场。
3
In everyday solids, liquids and gases, heat or thermal energy arises from the motion of atoms and molecules as they zing around and bounce off each other.