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“油”是人们每天必吃的食品。一天,小明同学在做炝锅面时,发现当把热好的油放入汤中时,油总是漂在汤的上面,用筷子搅拌后也还是如此,为什么会这样呢?小明同学猜想:可能是油的密度比水小,因为密度小的液体总是漂在密度大的液体上面。于是他决定测量一下油的密度,再和水的密度进行比较,这样就可以得出结论了。课堂上老师讲的是实验室常用的测量液体密度的方法:用天平测质量、量筒测体积,然后利用公
“Oil ” is the food that people will eat every day. One day, when Xiaoming’s classmate cooks rice noodles, he discovers that when the hot oil is poured into the soup, the oil is always dripping on the soup. After mixing with the chopsticks, the same is true. Why did Xiaoming’s students guess: It is possible that the density of the oil is less than that of water because the less dense liquid always floats on the more dense liquid. So he decided to measure the density of the oil and compare it with the density of the water, so that we can come to the conclusion. Classroom teacher talked about the laboratory commonly used method of measuring the density of liquid: balance with the quality of measuring cylinder volume, and then use the public