有效数字的定义

助力高考-秒杀二级结论-《高中物理手册》第三版上市!

有效数字的定义

是指测量中实际可以测量到数据,读数的规则是:从第一个不是零的数字开始往后数,有几位数字就是几位有效数字。

有效数字的例子

1是一位有效数字,1.0是两位有效数字,1.00是三位有效数字,1.000是四位有效数字。

0.1是一位有效数字,0.01是一位有效数字,0.001是一位有效数字,0.0001是一位有效数字。

0.10是二位有效数字,0.100是三位有效数字,0.1000是四位有效数字,0.10000是五位有效数字。


高中物理知识点总结

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