物理实验离不开使用一定的仪器,运用适当的方法对被测物理量进行测量,而实验测量和实验的最后结果是要用数字表示的。有效数字是各种测量和计算中一个很重要的概念,从仪器上读出的数字,通常都尽可能估计到仪器最小刻度线的下一位(存疑数字),仪器上直接读出的确切数字和最后一位存疑数字通通记录下来称为有效数字,它的末位是读数误差的所在位。有效数字是观测得来的,是测量过程的客观情况的记录,它的位数是不能随意增减的,学生在实验中,对直接测量,应如何正确读出、记录数据?在间接 Physical experiments are inseparable from the use of certain instruments and the use of appropriate methods to measure the measured physical quantities, and the final results of experimental measurements and experiments are expressed numerically. The effective number is a very important concept in various measurements and calculations. The numbers read from the instrument are usually estimated as much as possible to the next digit (the suspect number) of the smallest scale line of the instrument, and the exact number read directly on the instrument. The final suspect number is recorded as a valid figure, and the last bit is the digit of the reading error. The effective figures are observable, and are the records of the objective conditions of the measurement process. Its number of digits cannot be arbitrarily increased or decreased. In the experiment, how do students correctly read and record data in the experiment?