The vibrations which constitute a wave in a gas superposed on the random thermal motion.
气体中形成波的振动叠加在这种无规则热运动上。
In other words, the Mach number is a measure of the directed motion of the gas compared with the random thermal motion of the molecules.
用另一句话说：马赫数是气体的有序运动和分子无规则热运动的程度对比的度量。
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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