论文部分内容阅读
演示物体在空气中受浮力作用 给一个容积为50ml的试剂瓶装入30ml1:4的稀硫酸,另给一小塑料袋装入8颗锌粒,把袋口套在试剂瓶口,尽量排出袋里的空气,并用线扎紧袋口。用天平称此装置的质量,待天平平衡后再将袋里的锌粒倒进
The demonstration object is buoyant in the air and a 30 ml reagent bottle is filled with 30 ml of 1:4 dilute sulphuric acid. Another 8 bags of zinc are placed in a small plastic bag. The bag mouth is placed on the mouth of the reagent bottle and discharged as far as possible. The air and tie the bag mouth with the line. Use a balance to weigh the device and wait until the balance is balanced before pouring the zinc pellets into the bag.