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初中《物理》第一册第108页“研究液体的压强和深度的关系”的学生分组实验,由于平底玻璃管管壁厚,自身重量大,装入少量细砂时,重心高,不容易竖直立于水中.要使它竖直立于水中,须加较多细砂,这时玻璃管露出水面部分就不多了,允许试管浸入水中的深度变化范围小,实验效果不明显.为此,进行如下改进. 取医院照像用过的废底片,在水中浸泡十余小时,洗去药膜,裁成长20厘米、宽8厘米的矩形,卷
In the grouping experiment of “Research on the relationship between the pressure and depth of liquids” in the junior high school “Physics”, Volume I, due to the wall thickness of flat-bottomed glass tubes and their large weight, when a small amount of fine sand is loaded, the center of gravity is high and it is not easy to erect. Stand upright in the water. To make it stand upright in the water, add more fine sand. At this time, the surface of the glass tube will not be exposed. Allowing the test tube to dip into the water has a small range of depth change, and the experimental effect is not obvious. , to make the following improvements. Take the hospital’s camera used waste film, soaked in water for more than ten hours, wash away the film, cut into a rectangular growth of 20 cm, width 8 cm, roll