Why a piece of camphor placed on the surface of water begins to dance?
When impurities are dissolved in water, surface tension of water decreases. Hence, when camphor is dissolved in water, surface tension will decrease. Camphor being non-symmetrical, different amount of camphor is dissolved from different sides. Therefore, Surface tension will be different on different sides. Hence, unbalanced force sets the piece into motion and the piece of camphor begins to dance.
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