十万个为什么·科学阅读30篇（1）

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为什么泡泡一碰就破？

Soap bubbles look magical, but they’re actually very fragile films of water sandwiched between two layers of soap molecules.
The outer and inner surfaces pull inward due to surface tension, which keeps the bubble round and thin.
When a finger or dust touches it, that local area loses balance and the water layer drains instantly.
Evaporation also thins the film from within, especially in dry or warm air, making rupture more likely.
Adding glycerin or sugar to homemade bubble solution slows evaporation and increases flexibility.
Light bends differently through the changing thickness of the film, creating those shimmering rainbow colors.
Even gentle air currents disturb the delicate force equilibrium, causing early collapse before full formation.
Scientists study bubble physics to improve medical ultrasound contrast agents and food texture engineering.