One of the important reasons of fluid movement is pressure difference. Bulky fluid tends to flow high pressure side to low pressure-side. It is a bliss that physics have awkward methods. The Marangoni Effect, one of them, is a special case that explain interaction between fluids and surface tension. Before explanation regarding Marangoni effect, it had better to get a semi-touch with surface tension which is the interaction through boundary between liquid and air. It provides the least surface to liquid through boundary due to inter-molecular forces. "At liquid-air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). The net effect is an inward force at its surface that causes the liquid to behave as if its surface were covered with a stretched elastic membrane. Thus, the surface becomes under tension from the imbalanced forces, which is probably where the term "surface tension" came from. Because of the relatively high attraction of water molecules for each other through a web of hydrogen bonds, water has a higher surface tension (0.072 N/m at 20 °C) compared to that of most other liquids. " For instance, the surface tension of soap is lower than water. Therefore, while an amount of soap droplet is poured into the water, molecules of water are triggered to flow ahead liquid soap due to difference of surface tension. I have conducted an indoor experiment which is easy to carry out, as below: Physics is an illicit drugs that make people meddlesome. Have much fun.
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