空气加热，电弧向上的动作，因为它是密度较低，较凉的空气靠近它，它的速度移动，其中有浮力和阻力都是平等的。
Air heated by the arc moves upward because it is less dense than the cooler air around it, and it moves at a speed for which the buoyant force and the drag force are equal.
人类对电弧很熟悉------它是（这样形成的：）两个电极或两个点充上了电，携带着电流；突然，它们之间的空气充满了微小的，快速移动的电光。
Humans are familiar with arcing, where two poles or points are electrified, carrying an electric current, and suddenly the air between them is filled with a minor lightning bolt - zap.
利用分断电弧过程中的电流动态特性，使用移动平均法提取了每次分断电流的燃弧时间。
According to the dynamic behavior of the breaking current, breaking arc duration is extract from the breaking current waveform by using the concept of moving average of statistics.
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