perpendicular drop method

例句：

1. 1. This method is used to determine the concentration of a substance in a solution.
   这种方法用于确定溶液中物质的浓度。
2. 2.The perpendicular drop method is a simple and effective way to measure the density of liquids.
   垂直滴定法是一种简单而有效的测量液体密度的方法。
3. 3.In this experiment, we used the perpendicular drop method to measure the boiling point of water.
   在这个实验中，我们使用垂直滴定法来测量水的沸点。