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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