Abstract

When a camphor disk is placed close to a water surface, Marangoni convection occurs due to the surface tension gradient originating from the spatial distribution of camphor molecules at the water surface. We put plastic floats on the water surface to investigate the surface Marangoni flow, and observed that the plastic floats moved away from the camphor disk due to Marangoni convection. When the camphor disk was pulled up away from the water surface, the Marangoni convection weakened and finally disappeared. At that time, we observed that the floats approached the position just below the camphor disk. We discuss the mechanism of such float motion as related to the change in the structure of Marangoni convection and the change in the water level.

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