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材料:试管一只,两种色粒,分别可悬浮于水面与沉于水底,一根细线。试管选用口径大些长度中等的废管,两端均有破损但中间部分完好或虽有裂缝但不漏水的试管均可,配上软木塞。悬浮的色粒笔者采用红蜡烛凝固的烛泪,沉于水中的色粒使用绿的塑料电线剪成1～3毫米的小段即成。细线采用一般棉线,长度约60厘米。制作:先制好两种色粒,再将其装入试管中,倒满清水,用软木塞将试管塞紧,最后用细绳将试管两端拴住(如图1)。这时试管中两种色粒浮沉鲜明。演示:先将试管水平放置,使管内色粒无规则分布
Material: One test tube, two kinds of color particles, respectively, can be suspended in the water and sink to the bottom of the water, a thin line. Test tubes are selected from larger, medium-length tubes, both ends of which are broken but the middle part is intact or the tubes are cracked but not leaking. Cork stoppers may be used. Suspended color particles The author uses red candles to solidify the candle tears. The color particles that sink in the water are cut into small pieces of 1 to 3 mm using green plastic wires. The thin thread is made of normal cotton and has a length of about 60 cm. Production: First prepare two kinds of color particles, and then put it into a test tube, fill with clear water, plug the test tube with a cork stopper, and finally use a string to clamp the two ends of the tube (see Figure 1). At this time, the two kinds of color particles in the test tube float brightly. Demonstration: firstly place the test tube horizontally so that the color particles in the tube are distributed randomly