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How does soap clean?
Quick answer
Soap cleans because each soap molecule has two ends: one that loves water and one that grabs grease. The grease-loving ends latch onto oils and dirt, while the water-loving ends let water rinse the whole bundle away — lifting grime off your skin.
Step by step
- Soap molecules have a water-loving and a grease-loving end.
- The grease-loving ends grab oils and dirt.
- They surround grime into tiny droplets.
- Water then rinses those droplets away.
People also ask
How does soap clean?
Its molecules grab grease at one end and water at the other, so water can rinse trapped dirt away.
Why doesn't water alone remove grease?
Grease repels water, so it won't rinse off — soap bridges the two so water can carry grease away.
How does soap kill germs?
It breaks apart the fatty outer layer of many microbes and lifts them off so they wash away.
Part of the guide: Everyday Science: Light, Heat & Matter →