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在初中物理实验中,要用实验的方法研究各种物理规律,因此要定量地测量出有关物理量的大小。所谓测量就是借助仪器用某一计量单位把待测量的大小表示出来,即待测量是该计量单位的多少倍。对于待测量的测量可分两类。一类是用计量仪器和待测量进行比较,就可获得结果。例如,用刻度尺和物理课本长度想比较,读出物理课本的长度是25.85厘米。这一测量称为直接测量。另一类是不能直
In the junior high school physics experiment, we should use the experimental method to study all kinds of physical laws, so we must quantitatively measure the physical quantity. The so-called measurement is to use the instrument with a unit of measurement to be measured the size of that measured, that is to be measured is the number of times the unit of measurement. For the measurement to be measured can be divided into two categories. One is the use of measuring instruments and to be measured to compare, you can get results. For example, comparing a scale with the size of a physics textbook, the length of the physics textbook is 25.85 cm. This measurement is called direct measurement. The other is not straight