天平的两臂应该是一样长的 ,若真有一架不等臂天平 ,应怎样使用它来测物体质量呢 ?下面介绍两种测质量的方法。一、交换称量 ,利用杠杆平衡条件测质量设天平左臂长为ｌ,右臂长为Ｌ ,被测物体质量为Ｍ。具体方法是 :1、先将天平调平衡 ,将物体放在左盘中 ,在右盘中加砝码ｍ1 ,使 The two arms of the balance should be the same length. If there is an arm scale out of the balance, how should it be used to measure the mass of the object? Here are two ways to measure the mass. First, the exchange of weighing, the use of lever balance conditions to determine the quality of the balance of the left arm length l, right arm length L, the measured object quality M. The specific method is: 1. First balance the balance, place the object in the left disk, and add the weight m1 in the right disk.