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。

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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。

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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.

我们日常的固体、液体和气体，它们的热量和热能是从原子和分子在它们到处活泼跳跃和相互碰撞、弹开而上升。

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After that, they had to beat a combination lock, key lock, heat detector, motion detector, light detector and more.

CNN: Diamond heists are forever

The thieves, headed by Leonardo Notarbartolo, reportedly managed to penetrate some of the most advanced security measures, including hi-tech combination locks, motion and heat sensors -- and 18-inch steel doors.

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Also, every room has a large fireplace as well as motion sensors which control the heat, lights and even the shades.

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