器材: 竹筷1根,啤酒瓶1个,砂箱1只(可用抽斗盛黄砂,也可到砂坑去做这个实验)。步骤: ①让几个孩子在砂里插筷子,看谁插得快,插得深:然后在砂里插啤酒瓶,如果啤酒瓶底向下,费了很大的力,插不进去,砂上只留下一个凹陷。 Equipment: a bamboo chopsticks, beer bottles 1, sand box 1 (available pumping Sheng Huang sand, but also to the sand pit to do this experiment). Steps: ① let a few children inserted chopsticks in the sand, to see who inserted fast, inserted deep: Then insert the beer bottle in the sand, if the bottom of the beer bottle, spent a lot of force, can not be inserted into the sand Leaving only a depression.