The weight of a cup of water

Remember reading in middle school when a classmate's mother has died. She this every day in the classroom Kukutiti, who will not listen to her Jiequan. One day clever chemistry teachers had a cup of water used in the classroom he asked everyone said: "You think that cups of water with multiple "Some people say that students are 20 grams, and some people said 50 grams. The teachers in turn asked: "This cup of water weight is not important, it is important to how long you Nengna "We see that there is no answer to 1, he went on to say:" Na Yifen bell, everyone has no problem; Take one hour, there may be many people feel hand acid; take one day, some people may be Leide has collapsed. In fact, I am very sympathetic to students who experience, but she died in her mother here has been crying over one week, goes on like this Her findings will happen ah " The teachers have heard so pertinent goodwill persuasion, he finally Huangrandawu students, and immediately stop the Chouqi.