题目 (辽宁大连 ,2 0 0 0年 )　请写出测量盐水密度的方法 .要求至少写出三种方法 ,每种方法写出需要的器材、实验步骤以及相应的数学表达式 .本题的实验原理是 ρ=m/V,由于实验器材的多种选择 ,因此测量方法也有多种 ,现将联想到的几种求解液体密度的方法介绍如下 ,并附上同类 Title (Dalian, Liaoning, 2000) Please write down a method for measuring the density of brine. It is required to write at least three methods. Each method should include the required equipment, experimental procedures, and corresponding mathematical expressions. The experimental principle of this problem It is ρ=m/V. Due to the multiple choices of the experimental equipment, there are also many measurement methods. Several methods for solving the liquid density that are now associated with are introduced as follows, and the same class is attached.