hygrometric formula

例句：

1. 1. The hygrometric formula is used to measure the humidity in a room.
   湿度计公式用于测量房间的湿度。
2. 2. The formula for calculating the volume of a liquid is given below.
   计算液体体积的公式如下。
3. 3. The formula for this problem can be found in the textbook.
   这个问题的公式可以在教科书中找到。