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传统的表面张力实验有浮针、浮币实验和金属框肥皂膜实验。下面的一组表面张力实验,取材容易,效果明显且极为有趣,供同仁参考。 实验一 在干净的平板玻璃上倒少许红色水,由于水对玻璃是浸润的,在玻璃上会形成一层红色水膜。当在红色水膜中央滴上一两小滴酒精或酒后,则会看到在酒精滴处的红色水膜向四周扩展,出现一块“干”的区域。 这是由于滴酒精后,红色水与酒精分界处两种液体的表面张力系数不同,而水的表面张力系数较大,把分界线拉向四周的缘故。 实验二 把两根火柴相隔一段距离,平行地放在
Traditional surface tension experiments include floating needles, floating coin experiments and metal box soap film experiments. The following set of surface tension tests are easy to draw, effective, and extremely interesting for reference. Experiment 1 Pour a little red water on the clean plate glass. Since the water is infiltrating the glass, a red water film will form on the glass. When one or two droplets of alcohol or alcohol are dripped in the center of the red water film, the red water film at the alcohol droplets spreads around and a “dry” area appears. This is due to the fact that the surface tension coefficients of the two liquids at the boundary between red water and alcohol are different after alcohol is dropped, and the surface tension coefficient of water is larger, and the boundary line is drawn to the periphery. Experiment 2 Put two matches at a distance and place them in parallel.