Knowing both its size and its mass, he wasthen able to calculate its density, and thus make a plausible guess about itscomposition.
知道了它的大小和质量，并能求出密度，进而可对其成分进行估测。
When coating surface resistivity test on a longer pipeline is conducted, the pipeline can be divided into several sections to calculate it with polarization potential and current density.
在对长管道的涂层面进行电阻率测量时，可将管道分成若干段，通过极化电位和电流密度对涂层电阻车进行计算。
The result was a remarkably accurate estimate of a parameter called the gravitational constant, and from that Cavendish was able to calculate the density and mass of the earth.
测量结果惊人的准确，他测出了万有引力恒量的参数，在此基础上卡文迪许计算地球的密度和质量。
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