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有人说过:人的一生要吃9吨食物。这个数字显然太小了,人一生的食物摄入量很难用一个确切的数字去衡量。但是水就不同了,我们很容易就能估计出人一生的饮水量。一个人平均每天要喝七到八杯水。一杯水大约200毫升,七到八杯水就有1.5升左右。假设他可以活70年,那一生就需要喝水70×365×1.5=38325(升)。为了方便计算,不妨取近似值40000升,也就是40立方米。这个数字似乎并没有我们想象的那么惊人。
Someone once said: People’s life to eat 9 tons of food. This figure is obviously too small. It is hard to measure the amount of food that people have in their lives with an exact figure. But water is different, and we can easily estimate the amount of water we drink throughout our lives. One person drinks seven to eight glasses of water a day on average. A glass of water about 200 ml, seven to eight glasses of water there is about 1.5 liters. Suppose he can live 70 years, that life need to drink 70 × 365 × 1.5 = 38325 (liters). In order to facilitate the calculation, may wish to take an approximate value of 40,000 liters, which is 40 cubic meters. This figure does not seem that we imagine so amazing.