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 Soap is a surfactant, which means it is a compound that can lower the surface tension between two substances. When soap is mixed with water, it forms tiny structures called micelles. These micelles have a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail. When you rub soap onto your skin or clothes, the hydrophobic tails of the soap molecules attach themselves to dirt, oil, and other impurities on the surface. Meanwhile, the hydrophilic heads of the soap molecules remain in contact with the water molecules. As you continue to rub the soap, the hydrophobic tails of the soap molecules surround the dirt and oil particles, and the micelles form a structure called an emulsion. The emulsion allows the dirt and oil to be suspended in the water, so they can be easily rinsed away. Finally, when you rinse the soap off your skin or clothes with water, the emulsion containing the dirt and oil particles is rinsed away as well, leaving your skin or clothes clean. In summary, so