Cosmos

BEAUTIFUL

SOAP BUBBLES

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When water is splashed into a sink, a few bubbles form as air becomes incorporat­ed with the water, but because of water’s high surface tension they quickly disappear. When soap is added to the mix, the hydrophobi­c ends of the amphiphile­s stick out of the water, separating the water molecules and lowering the surface tension. This lower surface tension means that the water molecules aren’t quite as inclined to stick together, and when air is incorporat­ed, the bubbles form more easily and stick around for longer.

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