水当量

例句：

1. 1. The tank holds 50 liters of water.
   这个水箱能装50升水。
2. 2. The ship's displacement is 20,000 tons, which is equivalent to 20,000metric tons.
   这艘船的排水量为2万吨，相当于20,000吨。
3. 3. The amount of water required for the experiment was calculated based on the water equivalent of the chemicals used.
   根据使用的化学品的水当量计算了实验所需的水量。