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近年来,对实验的考查中,常会遇到设计性实验题。本文仅就如何根据所给的实验条件,完成密度的测量作一介绍,供参考。 在实验中缺少某个测量工具时,如何完成密度的测量呢?同学们只要把握以下几点,就可完成测密度的实验。 (1)要充分发挥水的作用 因为水的密度是已知的,由水的质量可知其体积;由其体积可知质量。 (2)注意寻找替代天平的杠杆 天平是等臂杠杆,利用天平测量质量。如果实验中缺少天平,只要有能替代天平的杠杆,根据杠杆的平衡条件F_1L_1=F_2L_2,也可知物体
In recent years, experimental examinations often encounter design experiments. This article only provides an introduction to how to complete the measurement of the density according to the given experimental conditions. In the absence of a measurement tool in the experiment, how to complete the density measurement? Students can complete the density measurement experiment by grasping the following points. (1) To make full use of the role of water Because the density of water is known, its volume is known from the mass of water; its mass is known from its volume. (2) Pay attention to finding the lever of the replacement balance The balance is the lever of the equal arm and uses the balance to measure the mass. If there is a lack of balance in the experiment, as long as there is a lever that can replace the balance, according to the balance condition of the lever F_1L_1=F_2L_2, it can also be seen that the object