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所谓“特殊”方法,就是在只有测质量或测重力的测量工具,而无测体积的测量工具的情况下,测物体的密度;或只有测体积的测量工具,而无测质量的测量工具,甚至既无测质量的工具又无测体积的工具,在某些条件下也能测物质的密度,以下我们讨论其中的一类方法,其实质就是用用特殊方法测体积。1、用相等法测某液体的密度。该方法是利用烧杯在盛满某液体或盛满水时,某液体的体积,水的体积都与烧杯容积相等的关系,水的密度为已知,求出其体积就是某液体的体积,具体操作过程如下。
The so-called “special” method is to measure the density of an object in the case of a measurement tool that only measures mass or gravity, but no measurement tool for measuring the volume, or a measurement tool that only measures the volume, and a measurement tool that does not measure the quality. Even tools that have neither mass-measuring nor volume-measuring can measure the density of the material under certain conditions. One of the methods discussed below is the one in which the essence is to use a special method to measure the volume. 1. Use the equal method to measure the density of a liquid. The method uses the volume of a liquid when the beaker is filled with a certain liquid or filled with water, and the volume of water is equal to the volume of the beaker. The density of the water is known, and the volume is determined as the volume of a certain liquid. The operation is as follows.